Games like Project: Firmament
Games like Project: Firmament include Halo: Spartan Assault, BALL x PIT, HELLDIVERS™ 2, STAR WARS™ Battlefront™ II, and 12 is Better Than 6. We matched them by the tags players give Project: Firmament on Steam (Action, Arcade, Shooter, Top-Down Shooter, and 2D): closest matches first, and among equally close ones the better-known games.
Halo: Spartan Assault
Shared: Action · Top-Down Shooter · Shooter
BALL x PIT
Shared: Action · Arcade · Top-Down Shooter
HELLDIVERS™ 2
Shared: Action · Shooter · PvE
STAR WARS™ Battlefront™ II
Shared: Shooter · Action · Space
12 is Better Than 6
Shared: Action · Shooter · Top-Down Shooter
Deep Rock Galactic: Survivor
Shared: Top-Down Shooter · Action · Top-Down
Starship Troopers: Extermination
Shared: Action · Arcade · Sci-fi
Kill The Crows
Shared: Action · Arcade · Top-Down Shooter
Escape From Duckov
Shared: Action · Top-Down Shooter · Shooter
Alien Breed: Impact
Shared: Action · Shooter · Top-Down
STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Sci-fi
Alien Shooter
Shared: Action · Shooter · Top-Down
HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Action · Shooter
DoDonPachi Resurrection
Shared: Top-Down Shooter · Shooter · Arcade
Dome Keeper
Shared: Action · Post-apocalyptic · Sci-fi
Crimzon Clover World EXplosion
Shared: Action · Arcade · Shooter
Half-Life 2
Shared: Action · Shooter · Sci-fi
DOOM: The Dark Ages
Shared: Action · Dark Fantasy · Shooter
BioShock Infinite
Shared: Action · Shooter · Singleplayer
Titanfall® 2
Shared: Shooter · Action · Sci-fi
Zombieville USA 3D
Shared: Action · Arcade · Shooter
Shadowgrounds
Shared: Action · Top-Down Shooter · Shooter
Fallout 4
Shared: Shooter · Post-apocalyptic · Action
Halo Infinite
Shared: Action · Shooter · Sci-fi