Games like Protect the Earth
Games like Protect the Earth include Bit Blaster XL, R-Type Final 2, Nova Drift, Planes, Bullets and Vodka, and Knightmare Tower. We matched them by the tags players give Protect the Earth on Steam (Side Scroller, Bullet Hell, Shoot 'Em Up, PvE, and Space Sim): closest matches first, and among equally close ones the better-known games.
Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Arcade
R-Type Final 2
Shared: Side Scroller · Shoot 'Em Up · Arcade
Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Casual
Knightmare Tower
Shared: Side Scroller · Bullet Hell · Shoot 'Em Up
Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Arcade
Vampire Survivors
Shared: Bullet Hell · Arcade · Casual
SpaceEngine
Shared: Space Sim · Casual · Sci-fi
Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Arcade
Cyberhunt
Shared: Shoot 'Em Up · Casual · Arcade
LUFTRAUSERS
Shared: Bullet Hell · Arcade · Shoot 'Em Up
DARIUSBURST Chronicle Saviours
Shared: Shoot 'Em Up · Side Scroller · Bullet Hell
Deep Rock Galactic: Survivor
Shared: Bullet Hell · PvE · Arcade
BALL x PIT
Shared: Bullet Hell · Arcade · Shoot 'Em Up
Warhammer 40,000: Space Marine 2
Shared: PvE · Action · Sci-fi
Megabonk
Shared: Bullet Hell · Arcade · Indie
Avorion
Shared: Space Sim · PvE · Space
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Arcade
DRAINUS
Shared: Shoot 'Em Up · Bullet Hell · Side Scroller
Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Space
Syder Arcade
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Sine Mora
Shared: Shoot 'Em Up · Bullet Hell · Side Scroller
Starship Troopers: Extermination
Shared: PvE · Sci-fi · Action