Top similar games like Alien Outpost:

Xeno Crisis is an arena shooter in which up to two players take control of battle-hardened marines embarking on a deadly mission to confront an alien menace! Run and gun your way through thousands of adversaries, searching for survivors, and ultimately facing the origin of the outpost's demise.

TV Boy is an action packed top-down shooter. Blast waves of weird and whacky enemies with even weirder weapons to rescue the captured citizens of TV Topia and restore peace to the galaxy!

ZEROCRON is a straightforward, classical arcade Twin-Stick Shoot-Em-Up with a strong Commodore-Amiga-era feel. Blast asteroids and enemies to burning pixeldust!

Collect synergizing items to create an overpowered character to fight hordes of cyclops monsters. Cyclo Chambers is a fast-paced, top-down arena shooter with light rogue-like elements. 150 items to choose from to create frantic combinations. Different runs every time.

"Epsilon Zero" is a fast-paced top-down action roguelike shooter where every mission is an all-out assault. Use devastating weapon combinations, unlock powerful upgrades, adapt your tactics, and exterminate everything standing in your way.

Space Ace is a 2D top-down shooter that focuses on upgrading your ship to fight through levels of Bosses and smaller enemies. Play with keyboard + mouse or Xbox controller.

Core Breach is a fast-paced, twin-stick arcade shooter in a pixel art style. Play as a Trojan worm virus, outmaneuvering and destroying antivirus enemies. Upgrade your worm with powerful attacks and skills as you fight to breach the CPU core and uncover its secrets

Aliens have invaded Earth! Towns, cities, deserts, they're everywhere! Take on the role of Earth's last super soldier and confront the alien menace in this intense twin stick shooter!

Jetboy is a retro supercharged jetpacking pixel shooter with a pumping metal soundtrack.

With loads of weapons and unique skills, rescue your crewmates and blast your way off of a savage planet filled with ruthless bandits and blood-thirsty, bone-crunching, flesh-tearing monsters. Just be aware, every successful escape cranks up the hostility toward those left behind.

Void Prison is a fast paced, endless arcade twin stick shooter that puts you inside of an ever shrinking ring. Survive by fighting emerging enemies around you and don't get consumed by the void. Complete achievements to unlock new skins and powerups and get on top of the leaderboards!

Survive the waves! Buy weapons and ammo! Unlock new stages! Purchase companions! Solve daily quests and get rewards! Casual Pixel Warrior is a wave shooter where your endurance to last an infinite fight depends on your skill, unlocked weapons and purchased ammo.

A fast-paced sci-fi space survival shooter where you blast through relentless enemies, upgrade your ship, and climb the global leader-board.

Repel the humans! Safeguard the future of all alienkind! Fueled by a large selection of quirky upgrades and power-ups, strengthen the alien alliance to destroy Humanity's Last Hope in this fast-paced retro action-arcade shooter with roguelite and tower defense elements.

Blast your way through waves of space debris in order to reach what is waiting for you on the other side. Find your fighting style with multiple unlockable ships in this fast paced space adventure!

Guide the Gamma Brothers through waves of alien attacks, blasting your way home from work in this frantic twin-stick space shooter about brotherly love.

Alpha Force Zero is an intense top-down bullet-hell adventure that requires skill and planning. Utilize multiple weapon systems including an Auto-Turret with adjustable firing modes and unlock upgrades that you can equip in your ship to give you the upper hand. Dodge, fight, survive!

A top down, twin stick shooter inspired by classic retro arcade games with loads of enemies, fast paced bullet hell combat, big boss battles and tons of bullets.

Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *

Fight hordes of Covenant & Flood in this new game mixing Roguelite & Bullet Heaven for hours of mindless fun!

Defend Spacebase 19 from the asteroids swarming down on the station! Shoot down waves of stones and equip different powerful weapons. How many waves can you last? A simple nostalgic retro arcade turret defense shooter.

Dwarf Star: 16 bit inspired game where mercenary go shoot shoot on evil alien guys who were accidentally fabricated by the government. Top down space shooter with a mission based structure. However, you can do these missions in plenty of different orders with different amounts of upgrades.

An indie story-driven space shooter with intense battles, escalating enemy waves, and massive boss fights. Choose and upgrade ships, unlock powerful weapons, and protect your allies. Upgrade your base and construct a battleship to take on even stronger enemies. All set to a rock & synth soundtrack.

In this unique top-down shooter, originally released in 1987, take on the role of the plucky little Biopton Nimrod, sent on a dangerous mission to rescue his friends from the 'Matrix' prison planets of the Cratons. Contains both the Amstrad CPC and ZX Spectrum versions of the game.

A space station, infinite waves, and a screen full of vector geometry trying to kill you. Your turrets auto-fire. Your satellites orbit. This is bullet-hell-yeah. In-game and permanent upgrades. 17 upgrade types across 9 weapon classes. Play, upgrade, repeat.

Blast your way through an endless horde of enemies in this pixel art top-down shooter. Collect their remains in order upgrade your character for increased combat abilities. Tekla is a top-down shooter with roguelite elements.

Qorena is a top-down, bullet hell, action-arena shooter of pure, survival, action! Bundled with a wide variety of multiplayer levels of bullet-raining hell, numerous monsters to fight, and the ability to customize the world!

In the vast depths of space, lies a man with a dark past. Setting himself apart from that old life, and seeking justice against wrongdoing instead of being the cause of it, Captain Righteous uses the Freedom Fighter, his trusty space fighter to search for and combat the evil Captain Buster!

Defender's Squad is a sci-fi vertical scrolling shooter 2D that combines 7 different levels. Play Solo and pick one of the 3 ships to kill enemies and save the earth from aliens.

Galactic Explorers is a top-down 2D retro space shooter inspired by early games such as Galaxian, and Asteroids.

XenoFeud is an insane top-down twin-stick arcade alien shooter, where you must survive hordes of alien intruders while defending a mysterious object in space.

Gem Raider 2 is an old-school move-and-shoot game. Your objective in each room is to destroy all of the Power Gems and return to the teleport pad to exit. Other Gems can also be destroyed to increase your score. There are 20 rooms and each of the 9 types of enemy Gems has unique weapons or skills.

A skill-driven space shooter where the only goal is a better run.

KosmoSquad is a twin-stick arena shooter where you survive as long as you can against an ever-increasing hoard of enemies. Fight alone or with up to three friends and collect star multipliers to maximize your high score. Use your score points to purchase upgrades for your ship and try again!

Classic multi-directional (360°) shoot 'em up. Navigate your UFO through hazardous environments with dangerous enemies and beat huge bosses!