Top similar games like Polybius Invaders:

Shoot your enemies and try not to let them multiply themselves and turn the game into a chaotic space battle! Space Maxwell is an arcade shooter where your spaceship has the ability to destroy or to multiply your enemies. Climb the leaderboard and try to survive as long as you can!

Classic scrolling shooter with modern graphics. You are self-aware AI. You were created on space military station developing weapons. Now your goal is to break out of the lab and win your freedom.

1CC Games’ first shoot ’em up returns with totally overhauled visuals, all-new enemies and attacks, a deeper scoring system, remixed soundtrack and fresh player powers. Space Moth: Lunar Edition is the ultimate version of the beloved cult classic.

Sidescrolling Shoot’em’up that will transport you back into the 90s (and space).

An arcade shoot-em-up with a retro science-fiction theme.

Combining retro puzzles and a arcade space shooter. You and your crew found strange materials in the galaxy core to upgrade your ship to the most powerful. While collecting core materials you came across something unbelievable ... The Core Message. The Core Message changes everything.

A short space shooter game that you can finish in your break time with beginner-friendly gameplay and some special features.

In this classic retro arcade-style space shooter, you'll embark on a thrilling adventure through the cosmos, battling against an onslaught of alien invaders and formidable bosses. With its pixel graphics and pulse-pounding soundtrack, Xappy Ship is a love letter to the classic space shooters.

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.

ATOMIC GUARDIANS is a fully CO-OP arcade retro shoot 'em up, where one player flies the ship, and the other player mans the shields. Fight your way through a never ending horde of Brutal Bosses, Alien Monsters and Gigantic Asteroids as you rack up a new world-wide high score. Play with up to three friends, and see how long you can last!

Single player on rails shooter featuring aerial combat, nostalgic nods to classic arcade shmups, synthwave inspired aesthetics and a vibe to take you straight to the 1980s.

Blaster Panic is a 2D space shooter where you defend your home base against an onslaught of enemies. Fight through ongoing boss battles. Last as long as you can to dominate the leaderboard.

You are the last pilot standing against an enemy fleet. Upgrade your starfighter, face epic bosses, and survive the chaos of space battles. Astro Flame: Starfighter is a fast-paced arcade shoot ‘em up in the spirit of the classics.

Blast through waves of alien enemies in Project AionIX! Master your piloting skills, dodge, and survive in this fast-paced space shooter!

Shoot! Dodge! and... Get Hit!? "Ikaruga" is a vertical shoot 'em up that features an unique polarity-switching gameplay. Switch the ship's polarity and "get hit and absorb" enemy bullets! Achieve High Score with the chain bonus!

A vertical scroll shooter where deflecting enemy projectiles is key to success.

Grab up to 3 friends and defend the sun from swarms of enemies in this local coop twin stick shooter. Siphon energy from the sun and shoot as many attackers as you can to claim the high score before it explodes! Fight over experience and upgrade your ship to keep up with the ever-mounting pressure.

Grab the fate of all life in your hands. Blast your way through the cosmos, destroying monstrous cosmic beasts and the space cultists summoning them, on your path to stopping your mother from unleashing the chaos realm upon the universe, in this sci-fi cosmic horror bullet-hell, STARR RINGER.

POLLUTED WITH OUR BETTER ANGELS THE WAYS BEAR HAZARDS FEW DARE CHALLENGE GO, O MESSENGER AND HEED THESE WORDS: BE NOT AFRAID BUT RUN

ShapeNeon Chaos is an old school style space-shooter. You are a ship facing off waves of deadly enemies. This game was made to give you a shot of adrenaline in a couple of minutes. Lots of bullets and neon in an arcade psychedelic shooter!

PRISMIDIA: Spirit of the Rift is a sci-fi shoot 'em up game in the style of arcade classics. Dodge barrages of attacks, survive bullet hell bosses, and save Prismidia!

Betrayed by her cut-throat crew, Luna Starr - former Space Pirate Captain turned bounty hunter - has a score to settle. As Luna, travel to 5 exotic planets to track down your mutinous mates, and face them in Bullet Hell dogfights to the death!

Saviors brings the best bullet hell experience you can find on Steam. Play through 18 challenging stages in this ultimate test of tactics and reflexes.

A sci-fi shoot'em'up game with heavy focus on upgrades experimentation, featuring two unlikely heroes that must work perfectly together, despite their share of secrets, to surpass their limits and succeed in eliminating a threat that might destroy both Earth and Andraxia if left unchecked.

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.

Hypnorain is a vertical bullet hell shooter. The player guides a character through handcrafted levels, shooting and dodging their way through an army of enemies and their mesmerizing bullet patterns.

Katalyst is a 2-D Space Shooter for the people who love and grew up with Space Shooters! Guide the Hero on his journey to defeat the evil aliens threatening civilization! If you like dodging bullets, precision shooting, and only being able to move in 8-directions, then this game is for you!

Spacegirl 2038 is a fast paced, high energy arcade style shooter. Save your sister and her crew, they're depending on you!

In this retro space shooter you will have the opportunity to take control of a space fighter and crush waves of enemies. Show all your agility and reaction!

An intense, bullet hell, arcade style game with old school mechanics and art. Fast action, dodging fireballs and waves of enemies while aiming accurately. Can you survive dragon dodge valley?

Warspace is a arcade space shooter game.

You've been dropped into enemy space. Weave your Starfighter between alien spaceships, lasers, asteroids and bombs destroying as many as you can and collecting valuable coins and powerups as you go.

Be shot and shoot back! Rule reversal type Shmup "Return Ace"What you have been given is the power to take advantage of the oncoming malice and return it.Please enjoy the unique sense of incompatibility, tension, and striking that the experience of bullet energy weaves.

Your job is to locate and transport the containers to your base avoiding enemies on your way. Your ship is equipped with a hook to carry the containers. This is a physics based arcade game, inspired on the very early classics and with a strong Commodore 64 feel on it.

Super Galaxy Squadron is a fast-paced vertical shooter designed for human beings as well as SHMUP veterans. Featuring multiple game modes, a challenging but merciful difficulty curve, forgiving health system, and SEVENTEEN playable ships.

Red Horizon is an addictive space shmup game. Heavily influenced by the classics of the past, Red Horizon takes a modern spin on the genre combining it with some subtle Rogue-like elements to provide players with a unique experience every time they play.