Games like Peace Keeper

Cosmonator is a single-player shooter game now available on Steam, featuring 40 hand-crafted levels, intense boss battles, and deep RPG-style character building. Customize your Cosmonator with over 30 passive upgrades and 40 unique spells, and test your skills in the endless gauntlet mode with leaderboards. With adjustable difficulty levels and controller support, Cosmonator offers a challenging and visually appealing experience for all types of players.

"Danmaku Unlimited 2" is an indie shooting game with 60fps HD graphics, featuring 5 action-packed stages and epic bullet patterns. Battle numerous enemies, level up your Senko fighter, and enjoy a rocking soundtrack by Japanese indie group BLANKFIELD. With external controller support, 4 difficulty levels, and additional game modes, the game offers a challenging and immersive experience for shooting game fans.

Steredenn: Binary Stars is an award-winning rogue-like shoot'em up game with intense boss battles, randomly generated environments, and a vast arsenal of weapons. Experience quick, challenging sessions with upgrades and space events, available now on PC, Xbox One, PS4, Nintendo Switch, and iOS. Receive critical acclaim with user ratings around 90% on Steam and an average press rating of 8/10.

Zero Strain takes the intricate abilities of a MOBA and distills them into a hyper-fast top-down shooter. Descend into the depths of uncharted dimensions and destroy everything in your path!

"Starward Rogue" is a twin-stick shooter roguelite where you play as a "head in a mech" from the neck of a Space Hydra. Explore evolving catacombs, choose from 9 starting mechs with unique abilities, and encounter 150+ enemies across 500+ rooms. Level up and buy upgrades through the perk system to create varied builds. Play with keyboard+mouse or gamepad.

BIRDCAGE is a fast-paced, single-player hack and slash shoot 'em up where you pilot the RADON gunship HALCYON, wielding both powerful guns and the unique SWORD weapon. Set in a futuristic sci-fi world, it features an engaging story spanning six intense stages with stunning visuals and a memorable soundtrack. Experience classic arcade action fused with modern gameplay and narrative depth.

"Monolithic Christmas Night" is a fangame of Five Nights at Freddy's and Star of Providence, with a unique twist of typing on a Writing Module to complete nights. The game features 5 nights with cutscenes and bullet-hell boss fights, as well as custom night mode and other gamemodes. Players must type quickly to survive as a gang of 12 crooks attempts to get them. Controls are available for both mouse and keyboard.

"Asteroid Bounty Hunter" is a space shooter centered around the veteran hero John and his AI spaceship. The game features unique boss fights, defense of nearby planets from asteroids, and battles against other bounty hunters. The concept revolves around farming experience for upgrades and collecting mastery points from rival ships. — NO RELEASE DATE OR DEVELOPER/PUBLISHER MENTIONED.

In this classic inspired Tower Defense Bullet Hell Shooter, security bots have revolted and you, the sole surviving pilot, are all that stands between the colonies and defeat. Upgrade your ship, weapons and turrets whilst facing a plethora of enemies and colossal bosses. Why did the drones turn?

"Survive in Space" is a challenging 50-level game where players, as Sasaki, battle through levels to redeem their people. Five powerful bosses, each with unique mechanics and environments, await at the end of every ninth level, providing a skill puzzle that evolves throughout the game. Players must stay alert and adapt to these shifting challenges to progress through the levels and win the game.