Games like Project: Gemini
Games like Project: Gemini include Brawlhalla, Broforce, BattleBlock Theater®, Awesomenauts, and Cuphead. We matched them by the tags players give Project: Gemini on Steam (Free to Play, Action, Local Co-Op, Platformer, and 2D Platformer): closest matches first, and among equally close ones the better-known games.
Brawlhalla
Shared: Free to Play · 2D Platformer · Platformer
Broforce
Shared: Action · Co-op · Local Co-Op
BattleBlock Theater®
Shared: Co-op · Platformer · Local Co-Op
Awesomenauts
Shared: Action · Platformer · 2D
Cuphead
Shared: Co-op · Local Co-Op · Platformer
Apex Legends™
Shared: Free to Play · Action · Multiplayer
Duck Game
Shared: Action · 2D · Platformer
PICO PARK
Shared: Co-op · Local Co-Op · Multiplayer
War Thunder
Shared: Free to Play · Action · Co-op
Move or Die
Shared: Action · 2D · Multiplayer
Destiny 2
Shared: Free to Play · Co-op · Multiplayer
Once Human
Shared: Free to Play · Action · Co-op
Halo Infinite
Shared: Free to Play · Action · Co-op
Spelunky 2
Shared: Platformer · 2D Platformer · Co-op
Castle Crashers®
Shared: Co-op · 2D · Local Co-Op
Gang Beasts
Shared: Co-op · Action · Multiplayer
Streets of Rage 4
Shared: Action · 2D · Local Co-Op
Marvel Rivals
Shared: Free to Play · Action · Multiplayer
SpeedRunners
Shared: Action · Platformer · Multiplayer
Ultimate Chicken Horse
Shared: Local Co-Op · Platformer · Multiplayer
Stick Fight: The Game
Shared: Action · Multiplayer · Local Multiplayer
Paladins®
Shared: Free to Play · Action · Multiplayer
SMITE®
Shared: Free to Play · Action · Multiplayer