Games like Captain Galactic
Games like Captain Galactic include Broforce, SANABI, Gravity Circuit, Sonic Mania, and pureya. We matched them by the tags players give Captain Galactic on Steam (Side Scroller, Action, Casual, 2D Platformer, and Platformer): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · Platformer · 2D

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

Gravity Circuit
Shared: Action · Platformer · 2D Platformer

Sonic Mania
Shared: Platformer · 2D · Action

pureya
Shared: Casual · Arcade · Side Scroller

Katana ZERO
Shared: Action · Platformer · Pixel Graphics

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D

Sonic Origins
Shared: Action · 2D Platformer · Platformer

Vampire Survivors
Shared: 2D · Pixel Graphics · Casual

Shovel Knight: Treasure Trove
Shared: Platformer · Action · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · 2D · Pixel Graphics

Twin Shot Deluxe
Shared: Action · Casual · 2D Platformer

Downwell
Shared: Platformer · Action · 2D Platformer

Rogue Legacy
Shared: Platformer · Action · 2D

Pizza Tower
Shared: 2D Platformer · Platformer · Action

NINJA GAIDEN: Ragebound
Shared: Action · Side Scroller · 2D Platformer

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · 2D Platformer · Pixel Graphics

Terminator 2D: NO FATE
Shared: Side Scroller · 2D Platformer · Action

Huntdown
Shared: Side Scroller · Action · Pixel Graphics

Brawlhalla
Shared: 2D Platformer · Casual · Platformer

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Side Scroller · Pixel Graphics · 2D

Rogue Legacy 2
Shared: Action · Arcade · Platformer

8BitBoy™
Shared: Action · Platformer · Casual

Bloodstained: Curse of the Moon
Shared: Action · Side Scroller · Platformer

