23 Best Alien Games for Mac OS

Fallout 2 or also known as Fallout 2: A Post Nuclear Role Playing Game is an Open World Action-RPG (Role Playing Game) video game developed by Black Isle Studios. The game takes place in 2241 in distant future where a worst ever drought hits the primordial city of Arroyo. The elder of the village asks the descendant of the “Vault Hunter” to come forward and help the villagers by finding the ancient Environment Restoration Device named as Garden of Eden Creation Kit (GECK). The chosen one gathers up his/her gear and starts off his journey into the wilderness of a drought ridden open world and the story continues.Fallout 2 offers a new and quite extensive Storyline along with a larger gameworld that the Previous Hit of the Series Fallout and lets you experience similar type of game mechanics and and visuals as well. Fallout 2 was a massive hit from the year it released back in 1998 and is still famous among the true Action-Adventure and RPG game enthusiasts. With game mechanics mostly built on the blue prints of Fallout, an Extensive storyline, superb graphics and a significantly larger game world, this game is a wonder If you want to enjoy Fallout 3 and Fallout 4 properly, you should play the Fallout and Fallout 2 first. it’ll definitely make it your most favorite Action-RPG experience ever.

Castle Crashers is a 2D Action-Adventure, RPG, Hack and Slash and Beat ‘em’ Up video game by The Behemoth. The game is set in a Fictitious Medieval Era Kingdom and lets you be the Ultimate Savior who frees the Kidnapped Princesses and kills the Evil Magician by the use of his bravery, Sword and intuition. The game takes place in a fictional Medieval Era in a Medieval Universe and it kicks off with the Four brave Knights attending a party, in King’s massive Castle where the evil dark Wizard arrives and steals the Mystical Gem and kidnaps the Princess. As the most Brave and courageous beings, The Kings sends the Knights to rescue the Princess and to retrieve the Gem. According to the storyline, your ultimate goal is to find and defeat the Dark Wizard along with his minions and monster legions. Now in order to complete the game objectives, you must gather your team, go hunt down the bizarre and brutal Cyclops, a strange cat-fish and all the aliens. With a very involving story, epic gameplay, loads of enemies and all the monster fighting fun, Castle Crashers is one amazing Action-RPG video game to play and enjoy.

Risk of Rain is an amazingly Addictive and quite immersive Action-Adventure and Puzzle-Platform video game by Chucklefish Games. The game offers an amazingly addictive game-play in which your task is to Explore a mysterious planet, fight off the alien enemies, Solve some challenging puzzles on your way to finding parts for your broken ship, repair it and escape. The game lets you be a survivor of a fatal Space ship crash, allows you to explore a mysterious planet and fight off the randomly spawning enemies and bosses. Risk of Rain lets you play as a single player or if you want you can join your friends in an Online Co-Op mode, traverse through the planter, collect different items, tools and power-ups, find the Teleporter to finally escape the planet. With amazing Side-scrolling and Shooting elements, Risk of Rain features Single and Co-Op Multiplayer mode, 12 amazing characters, a lot of different enemies and super cool encounters with the bosses, 10 amazing game levels, wonderful visuals and a lot of other cool things for you to enjoy.

Hack, Slash, Loot is a cool Rogue-like Action-Adventure, RPG, Dungeon Crawler and Puzzle video game developed by David Williamson. Hack, Slash, Loot takes yo to an amazing journey of traversing the places where no one ever dared to go. You as the courageous warrior are destined to go fight against the evil forces in order to cleanse the world from murky existence of the evil and to loot epic treasures. Hack, Slash, Loot lets you explore the dungeons as a lone heroic warrior, hack and slash your way through the hordes of monsters, loot the treasures and master the art of being a badass hero. With an amazing amount of Adventures waiting for you to go on, 30 new characters, 6 amazing quests, huge piles of items, monsters etc, great retro-styled visuals, and a brilliantly involving game-play, Hack, Slash, Loot is an awesome game to play and enjoy. Try it out and enjoy a totally epic Action and Rogue-like Puzzle-Platform experience.

XCOM: Enemy Unknown is a Military Themed Tactical and Turn-Based RTS (Real Time Strategy) and MMO, Role Playing video game set in an era of Global Alien Invasion. The game is developed by Firaxis Games and allows you to control a technically advanced organization named as XCOM and defend the Earth. You are tasked to lead your troops in the field, fight off and capture the aliens, Build research labs, develop new technologies using alien technology, expand your Organization’s operations, manage XCOM’s assets, monitor alien activities and respond to wherever your assistance is required. XCOM: Enemy Unknown is an outstanding strategy video game with a lot of campaigns, action packed game-play, sleek and state of the art Graphics, great cinematic animations, a lot of fun filled mini games etc. XCOM: Enemy Unknown offers an amazing standalone expansion named XCOM: Enemy Within that adds tons of new stuff (Weapons, new missions, more upgrade options etc.) to the main game. XCOM: Enemy Unknown is a great MMO and Strategy video game to play and enjoy. Do try it out.

XCOM 2 is a brand new Military Theme, Turn-based, Tactical Real Time Strategy and MMO video game by the popular Firaxis games. XCom 2 is the direct sequel to the 2012’s insanely popular XCom: Enemy Unknown and offers a similar gaming experience with enhanced mechanics and loads of new upgrades and perks. According to the story of the game, The aliens invaded again and this time the invasion was so strong and devastating that it sent the humanity in despair. The seized control over the major facilities and defeated the XCOM and surrendered with the Key operatives hiding in places nobody could know about. Alien’s Puppet ADVENT Administration prevailed, and Years later XCOM became a small resistance and started a new oppressive against the Aliens. This is where you get into the play as a Commander and the story takes another turn that writes the fate of Humanity. Now you must blow the soul back into XCOM and let the Aliens know about What XCOM is capable of. XCOM 2 is set in the future in the year 2035, after the events of XCOM: Enemy Unknown and allows you to get in the role of the Commander of an eponymous Tactical and Military Organization named as XCOM. XCOM 2 tasks you to take Charge of the New XCOM base named as Avenger, gather and train your forces and send them on a number of challenging missions in order to oppose the Alien enemies who have occupied a large area of the game world after the Invasion and are engulfing the world slowly but steadily. You must think strategically, deploy your forces on key spots, build new research and technological facilities, find and team up with Central Officer Bradford and launch a massive attack on Alien bases, gather up the resources such as Elerium Core, get Dr. Richard Tygan rescued and defeat the Aliens once and for all. XCOM 2 offers enhanced game mechanics, brilliant visuals, and a totally immersive gameplay along with all the brilliance it can offer. Do give it a go.

Xenonauts is a Sci-Fi Turn-based Tactical-RPG and Strategy video game that offers a brilliant gameplay with similarities to XCOM series games. The game draws heavy inspiration from the Original X-Com and is set in Alternate timeline of Earth where you take on the role of the Commander of Xenonauts, an organization leading the resistance against the invasion. Your main task is to reorganize your army units, collect the funding for various projects, launch numerous missions to intercept enemy UFos and complete the game objectives by defeating the enemies and capturing all of their ships plus their base. Xenonauts offers similar mechanics to its predecessor and the original game of the series X-Com and allows you to enjoy leading epic missions against the enemies, show off your superior Tactical and Strategy skills, engage in epic combats and enjoy an immersive game-play. With all the refined aesthetics of X-Com, visually stunning and quite brilliant game-play plus the addictive nature, Xenonauts is a wonderful game to play.

Space Pirates and Zombies (SPAZ) is a cool Action-Adventure, Indie, RPG, Strategy and a Top-Down Space Combat and Shooter video game that allows you to explore an amazingly huge randomly generated galaxy and fight against the hostile Factions, Zombies and other enemies. Use your best skills to destroy alien ships, installations and facilities. Being in charge of a whole fleet of futuristic and most advanced space ships, and commanding the whole army is one of the best aspects of this super thrilling video game. Enemies include, aliens (Different races), humans and zombies that have infested almost every corner of the galaxy and they have mastered the art of evolving by creating a multi-tiered ecosystem that supports them with their plan of conquering the galaxy. With a lot of ships to fly in and build, pilot etc., a great physics based combat structure, a lot of different enemies, great visuals and an addictive game-play, Space Pirates and Zombies SPAZ is a wonderful game to play and enjoy.

Tower of Guns is a hardcore Action-based Rogue-like Shooter video game. The game offers wonderfully addictive and engaging randomly generated game levels in which your task is to be part of a world where everything is trying to kill you. The only way to survive is to shoot back in time and accurately. Different types of Guns and Perks are your ultimate weapons, Use them to bring down the robots and turrets, evade their projectile attacks, collect the blue tokens, power-ups and other items, weapons etc. use upgrades to enhance your guns and clear the randomly generated game levels. With an amazing amount of hardcore action and thrill, super cool Rogue-like visuals and a crazy addictive game-play, Tower of Guns is a wonderful game to play and enjoy. Do try it out, it’ll definitely entertain you with all the amazing Action, Rogue-like and Shooting elements.

In Space We Brawl is a cool Action-Packed and thrilling Shooter video game that takes you to an amazing world where your only task is to fight against the enemies and eliminate them while maneuvering your ship through the hardest of environments. The game offers an amazing Co-Op multiplayer game-play in which you can simply outwit your friends by making 150 amazing combinations of attacks and by the use of amazing amounts of weapons (Laser Canons, Plasma Swords, Flame launchers, Missiles etc.) and stuff. With amazing 8 new space areas to explore, epic enemies and bosses, wonderfully challenging battles and environmental hazards like Black Holes, Asteroids and Alien Nests etc. challenging game-play, great visuals and great perks, In Space We Brawl is a great game to play and enjoy. Do give it a try, it’ll definitely entertain you well.

Edge of Space is an addictive Action-Adventure, Indie, RPG video game by Handyman. The game lets you be an operative of Ark Corporation and travel to the distant regions of the space to explore and find the habitable planets that can be Terraformed. After waking up from the Cryo-Sleep you’ll find out that you have traveled to an unknown location in the vicinity of an unknown planet. Now you must land on the planet, explore, survive by fighting off the enemies and repair your ship to get back home. Edge of Space provides you with a lot of resources, weapons, and a unique crafting system that helps you craft almost anything you want. With all the fantastic Visuals, a great storyline and addictive gameplay, Edge of Space is a great Action-Adventure, RPG and Indie video game to play and enjoy.

Assault Android Cactus is a great Action and Thrill filled, Top-Down Shooter video game. The game combines amazing Arcade and Shooting elements together and provides with a classic game-play in which your task is to eliminate your enemies while going through the hordes of robotic enemies and giant bosses. As the Constable Cactus, you must respond to the distress calls and go hunting the enemies by the help of a huge weapon arsenal, amazing skills and qualities etc. Assault Android Cactus offers 8 beautifully created playable characters, amazingly addictive 25 missions/campaigns, wonderful permanent perks, epic bosses and combats, co-op multiplayer mode along with great visuals, superbly engaging and challenging game-play and other cool stuff. Assault Android Cactus is one of the best Action and Top Down Shooter video game to play and enjoy, do try it out.

Subnautica is a brand new Open World, Adventure and Survival video game set in the underwater world of an alien planet. Subnautica is set in a futuristic Era of the 22nd century, and it offers a futuristic experience. It refers to a period when Humanity started exploring and inhibiting the alien planets. To colonize the planets, various advanced vessels were sent on Exploration Missions. One of the Vessels named as Aurora was also forwarded to an exploration and terraforming mission to an alien water world known as 4546B. The vessel was on its way to a station on the planet when an unknown energy source disabled it. With a hull badly damaged, and all the systems failed, the vessel crash landed into the water and sank to the ocean floor. This is where the player character gets into the play. After getting out of the life pod, the palyer must explore the world, find means of survival (Food, Drinking Water, Oxygen to breath, etc.) in an alien world, defeat all the underwater alien life forms and survive by evolving in the environment. Resource collection has its own importance in the game because without resources there is no survival. Subnautica offers various game modes such as Freedom Mode, Hardcore Mode, Creative Mode as well as unique Crafting abilities, great upgrades, beautiful graphics and addictive gameplay.

This superbly engaging and award winning sequel to the original Shadowgrounds is a wonderful game. Packed with Action-Adventure, RPG and Shooting elements, Shadowgorunds Survivor is one of the best Top-Down Shooters out there in the market. The game puts you into the character of one of the Last remaining survivors of Jupiter’s Moon Ganymede and allows you to fight against the enemy aliens while using your best combat skills and a lot of different kinds of weapons. With 3 new characters to choose between, a lot of futuristic weapons, enhanced combat tactics, cool upgrades, beautiful visuals and a hardcore immersive game-play, Shadow grounds Survivor is a great Top-Down Shooter, Action and RPG game to play and enjoy.

Nexuiz is a Single and Multiplayer FPS video game developed by Alientrap. The core game-play of Nexuiz is heavily inspired by Quack and is built using a modified Quake gaming engine. The game provides with hundreds of inbuilt and user created maps, fifteen characters to choose between, ultra-realistic graphics, whole lot of traditional and non-traditional weapons and a fast-paced game-play. In single-player mode you can play the game in campaign but the multiplayer mode allows you to take part in different gaming modes like Team Deathmatch, Capture the Flag, and Survival etc. Nexuiz also provides with an old school type of game world setting so the game seems a little bit more engaging and playable. Game objectives are to kill the enemies, earn experience points and defeat the bosses. You can use the earned experience points to buy upgrades to improve your skills and fire power. Nexuiz is one of the best replacements to Serious Sam because it provides with a great resemblance to a lot of thing. You’ll definitely enjoy playing.

Anomaly: Warzone Earth is another great combination of Strategy, Action and Tower Defense elements that tasks you with saving Earth from invading aliens. With a hold on most of the planet, aliens are occupying earth swiftly so you must act fast, make strategies, build towers, deploy weapons and kill them all before it’s too late. In order to defeat the enemies, you must lead your troops and deploy them strategically in every corner of the planet, use your special abilities, think fast and win the epic tactical battles to throw the aliens out of Earth. With an innovative and immersive game-play, amazing visuals and brilliant storyline, Anomaly: Warzone Earth is a masterpiece. Do give it a try.

Elite Dangerous combines the elements of Space Trading, Adventure, Combat, and Simulation. It offers both Single and Multiplayer modes developed and published by Frontier Developments. The game takes place in the fictional galaxy called Cutthroat and offers an open environment to explore. It lets the player create and customize his own starship and explore the realistic 1:1 Scale Galaxy focused on Milky Way. It has three different factions such as the Federation, the Empire, and the Alliance. To get into the game world, the player must select his faction and complete a series of challenging missions and earn fabulous prizes. He can trade with other to earn money and use to unlock further content. Protect the galaxy from rival factions and fight against enemies using weapons. The game unlocks other galaxies and milky ways as the player complete the series of objectives. He can upgrade his ship with different items and weapons using the money. Elite Dangerous offers key features such as a variety of Missions, different Ships, Unique Game Experience, over 400 Billion Star Systems, and more. Elite Dangerous is the wonderful game to play and amuse.

X3: Terran Conflict mixes different genres such as Trading, Combat, Exploration, and Space Simulation. It is developed by Egosoft and published by Deep Silver. The game takes place in the massive space environments and lets the player explore the game world from first-person perspective. To get into the game world, the player must create and customize his/her starship with different items. There are different races such as Xenon, Terran, Split and more and the player can select one of them and start his journey to navigate ship around different sectors. The game world comprises thousands of stations and ships and the player can create his colony, gather resources, and trade with NPCs to earn money. He has to fight against rival alien races to protect his colony and defeat them to earn amazing rewards. The Ship can be upgraded by using experience points that the player earned by complete objectives. X3: Terran Conflict includes key features such as New Factions, Largest X Universe, over 100 Spaceship, Management Tools and more. Try it out.

Duke Nukem Forever developed by 3D Realms and published by 2K Games is a Single and Multiplayer First-person Shooter video game available to play on Multiple platforms. It is the sequel to the Duke Nukem 3D released in 1996 as an exciting installment of the long-running series named Duke Nukem. The game takes place in the fictional world invaded by aliens. The story centers on the protagonist who must come out of his retirement and have to fight against aliens when they start capturing the Earth’s Woman. Take on the role of the protagonist named Duke Nukem and explore the world from the first-person perspective and accomplish a set of levels. You can interact with different objects including urinals, water coolers, white boards, which enable you to draw your images. As the game proceed, it becomes challenging. Navigate the world, fight against aliens, collect power-ups and earn experience that you can use to upgrade your weapons. Duke Nukem Forever offers prominent features such as Variety of Missions, Multiplayer mode, World Interactivity, and more. Try it out, and you’ll enjoy it.

The Bureau: XCOM Declassified is an Action-Adventure, Third-person Shooter and Single-player video game for hardcore players created by 2K Marin and published by 2K Games. It is the fantastic sci-fi title in the series of XCOM and offers tactical shooter gameplay with an emphasis on team-based tactics. You assume the role of the main hero, an agent named as William Carter, who must command two other agents in each mission. The protagonist has multiple abilities such as lifting enemies, healing his squad and summoning combat. Other agents are split into four categories such as Engineer, Recon, Commando, and Support. Each category has a set of weapons and powers. The game takes place in the historical year 1962, during the cold war between the Soviet Union and the United States. You have to control your character and explore the world from a third-person perspective, use a variety of weapons and struggle to complete several missions to earn points. Use your points to unlock further content in the game and dominate the battlefield. With improved mechanics, graphic details, smooth controls, realistic sound effects, The Bureau: XCOM Declassified is the best game for players who love playing shooting games.

XCOM 2: Alien Hunters is an Expansion Pack for the original game XCOM 2 developed by Feral Interactive and published by 2K. The game mixes the Turn-based Strategy, Character Customization, Aliens, Tactical, and Sci-fi elements and supports both Single and Multiplayer modes. The expansion pack enables the player to turn his soldiers of XCOM into an alien squad with new armors and weapons to fight against new Alien bosses that will struggle to pursue his team across the gameplay. There are several playable characters available, and the player can choose one of them before getting into the game where he has to battle against another faction to complete his goals to earn points. The player can participate in the turn-based battle, where he must make a strategy to take down his opponents easily. XCOM 2: Alien Hunters offers core features such as Head to Head Multiplayer Mode, lots of Missions, Tactical Guerrilla Combat, Resistance Fighters and more. With addictive gameplay, futuristic environments, highly-detailed world, and beautiful soundtracks, XCOM 2: Alien Hunters is the fantastic game to play and enjoy.

XCOM: Enemy Within is a Downloadable Content Pack for the XCOM: Enemy Unknown released for multiple platforms developed by Firaxis Games and published by 2K Games. The DLC pack introduces new gameplay elements, as well as features new themes of transhumanism. The gameplay and plot remain the same like the original title with some extra features. In the game, the player needs to manage the headquarters of XCOM in real-time, but most of the gameplay comprises turn-based combats against rogue human faction and invading aliens. The game includes the Meld (the new resource), the player must lead his army to fight enemies while securing Meld. Single-player campaign consists of forty-seven maps and introduces thirteen maps in multiplayer mode. XCOM: Enemy Within offers core features such as New Soldier Abilities, New Equipment, and Weapons, Strategic Resources, Multiplayer (Maps, Units, and Abilities), etc. Try it out, and you’ll love it.

Crimsonland is a Superbly Action-Packed, Fast-paced Thriller, RPG and Top-Down Shooter video game by 10Tons LTD. The game takes you to a Futuristic and Sci-Fi world of Crimsonland and allows you to fight against the Hordes of Aliens, Mutants, Giant Spiders and Zombies and assesses your abilities of staying alive in a world where everything wants to kill you. Acording to the storyline, the game spawns you right in the middle of an enemies infested world where they attac you from all directions. Your task is to simply keep your self at a distance from the enemies and continue to fry them, while keeping in view your own health. On every enemy kill, Crimsonland rewards you with experience points and that helps you get to the higher levels of experience. Once you are at the advanced levels of the game, you can have all the fantastic Perks that help you reload faster, shoot faster and react faster. Furthermore the dead enemies keep on dropping the bonus packs that you can pick and have some extra points, temp invulnerability, slow time and kill multiple enemies with one shot etc. Crimsonland offers a number of action packed game modes such as Quest Mode, Rush Mode, Survival Mode and Type ‘o’ Shooter Mode. With an amazing Top-Down perspective, Futuristic weaponry, amazing Quests, Epic Battles, great perks, multiple engaging gaming modes, great visuals and a totally addictive gameplay, Crimsonland is a blast.