Top similar games like Gray Goo:

Ranphon is a side-scrolling space shooter where you control a small ship called Phon in a vast and frantic space full of hostile spaceships.

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

Defend the Little Spaceman Dudes from aliens! Blast waves of Alien Abductors and UFOs across 50 challenging levels in this fast-paced ’80s-style arcade space shooter.

A quick and action paced retro styled arcade shooter, or shoot 'em up (shmup) if you like. Perfect to play in short chunks, like when you are waiting for big games to download.

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!

WE HAVE ALIENS, YOU DON'T—Blast Martian invaders and flying saucers across 30 stages with robotic voice effects. Use your destructible shield, rescue army men for bonus points, and chase the high score.

Cyberpunk 3776 harkens back to the glory days of arcade shoot-em-ups. It all begins on a postapocalyptic earth and proceeds into space. Your journey will be a metaphor about life and death, a road that every person has to walk down alone. The only choices you get while on your path to the inevitable end: keep your head up high or forfeit.

Blast and weave your way through enemy fire while managing a wide variety of ship power-ups in this retro style horizontal shoot-'em-up!

Moonless is a challenging side-scrolling platformer in the style of classic arcade games of the 1980s, where you control a helpless astronaut who has been left stranded on the moon, and now has to face an invading alien force to earn a chance to go home.

Remember the golden age of arcades playing a game with all the classic 80's/90's space-shooting features. See how far you can go by destroying all enemy robots that are ready to planet earth attack.

Survive 10 enemy stages! Shoot 'Em Up style, spaceship game, in pixel art and 8-bit retro music! Evolve your shot to the maximum level, use the energy bar for upgrades, and special abilities! Advance each stage by defeating Bosses and enemies to collect new skills, transformations and extra lives!

Captain Galactic is a colorful retro sci-fi platformer where you ride a hoverboard through strange alien worlds, collect crystals, unlock abilities and items, dodge deadly traps, and blast enemies with your phaser.

A micro horde-survival roguelike where time only moves when you do! Level up, choose your skills and slaughter thousands of monsters. Jump in the monster-slaying arena and piece together your collection of gear, characters, and stages to become the ultimate survivor!

Blast through the cosmos in Alien Skies, a neo-classical side-scrolling space shooter! Pilot your starship across diverse alien worlds, unleash devastating weapon upgrades, and upgrade your ship to conquer an ever-growing alien threat.

Battle for Asciion is a classic horizontal shoot ’em up built entirely from real text characters. No sprites. No pixels. No images. Just pure ASCII action, massive bosses, weapon upgrades and retro arcade challenge.

Do you miss the times when games were not holding your hand? When they did not forgive mistakes and controls and rules were clear and simple to learn? YES? So you miss the 90s!

The Aliens are back for revenge. You're the only one standing between them and total annihilation. Blast through waves of enemies, dodge bullets (and cosmic insults), and defend the solar system in this retro-inspired arcade shooter — one ship, one chance, no negotiating.

A spectacular, satisfying, and super-watchable defense battle! The ultimate 8-bit shoot 'em ups born in the 21st century, ""Changeable Guardian ESTIQUE"", is now on Steam!

Code Arcturus is a retro inspired arcade-style action platformer, with aliens, robots, spikes, explosions, and lots of coins. Blast your way through levels, compete for the fastest times on the leaderboards in Speedrun mode, or put your skills to the ultimate test in Nerfed mode

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

The year is 2051. Location: SATAZIUS, a long-abandoned planet. The cruiser Agano was on patrol when it was attacked and stricken by a confederacy of space pirates that had established a base on SATAZIUS. The pirates attacked the Agano intending to steal the assault ship ‘Trafalgar’ that was stowed aboard the Agano, but the Trafalgar made...

Collection of a few arcade classics, remade with a fresh and friendly looking art style and a beautiful soundtrack.

SpaceDRG is a high-octane, motion sickness inducing action game featuring cute pixel art graphics. Fight against the letters D, R & G in a space themed 1980s retro arcade environment.

A sci-fi 80s retro shooter and bullet hell. Use your plasma cannon and bombs to repell an alien invasion. Either defeat the alien robots building and upgrading the blocks and turrets - or blow all of their blocks up! 20 straightforward levels.

A retro arcade space shooter where you blast alien fleets, dodge bomb swarms, collect power-ups, and fight solo or in local co-op to liberate occupied planets from the mind-controlling energy force code-named Xenmega.

PewPew! - move, shoot and upgrade!

A sci-fi retro side-scrolling shoot-em-up / rescue game.

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.

Defeat alien fighters with the ultimate surface-to-air weapon KPO9!

The Japanese just love their famous German-inspired Baumkuchen cakes, and hungry invaders from across the universe have discovered these delicious treats too! Are you up to the challenge of protecting the precious desserts from waves of alien attacks? Save the cakes!!

This is a retro space shooting game, where you only fight against the strongest enemy. There are 15 unique bosses in the game, and players need to use different weapons and strategies to defeat them. Dedicated to you who are both challengers and retro game lovers.

Pew Pew Pew, KaBOOM! is a challenging old school arcade game filled with action! Unlock new costumes and enjoy the awesome Chiptune OST as you reach new highscores!

Distant Space are present the arcade game of cosmic fights in arcade style of the 80's, this is a game where you can control the spaceship and forced to destroy extraterrestrials, which are moving in the certain order.

TROID BLASTER 2 is a physics based asteroids tribute game, featuring: * Random Levels * Gachapon random generated pilots and ships * 30 weapon types to unlock * Physics based! * Hundreds of bite sized levels to play * A graveyard to bury and remember your fallen pilots

In Infinity Blaster you blast through space, defeat challenging enemies and upgrade your weapons! Compete on the global leaderboard, survive an infinite loop of increasingly difficult foes, and unlock 100 achievements. Can you prove yourself as the ultimate space adventurer?

Star Tank is a shmup with eighties aesthetics, a mixture of styles (Galaga-Operation Wolf). A difficult game that requires great control skills. 20 stages. 5 bosses. Various enemies. Become an expert pilot of a StarTank!!!!