Games like Galacticon
Games like Galacticon include Super Meat Boy, Celeste, Downwell, Huntdown, and Bit Blaster XL. We matched them by the tags players give Galacticon on Steam (Hero Shooter, Shoot 'Em Up, Precision Platformer, 2D Platformer, and Shooter): closest matches first, and among equally close ones the better-known games.
Super Meat Boy
Shared: Precision Platformer · Platformer · 2D Platformer
Celeste
Shared: Precision Platformer · 2D Platformer · Platformer
Downwell
Shared: Precision Platformer · Platformer · 2D Platformer
Huntdown
Shared: Shooter · Shoot 'Em Up · Action
Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Arcade
VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer
Contra: Operation Galuga
Shared: Shooter · Shoot 'Em Up · 2D Platformer
Alex Jones: NWO Wars
Shared: Shoot 'Em Up · 2D Platformer · Shooter
Broforce
Shared: Action · Platformer · 2D
Katana ZERO
Shared: Action · Platformer · 2D Platformer
SANABI
Shared: 2D Platformer · Action · Pixel Graphics
Paladins®
Shared: Hero Shooter · Shooter · Action
Gravity Circuit
Shared: Platformer · Action · 2D Platformer
Kero Blaster
Shared: Shoot 'Em Up · Platformer · Shooter
Pizza Tower
Shared: 2D Platformer · Platformer · Indie
Team Fortress 2
Shared: Hero Shooter · Shooter · Action
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Action · Shooter
ZeroRanger
Shared: Shoot 'Em Up · Action · Arcade
Intrusion 2
Shared: Platformer · Action · Shooter
METAL SLUG
Shared: Shoot 'Em Up · Arcade · Action
Ambidextro
Shared: Precision Platformer · 2D Platformer · Action
LUFTRAUSERS
Shared: Shoot 'Em Up · Arcade · Action
RIVE
Shared: Shoot 'Em Up · 2D Platformer · Arcade
Terminator 2D: NO FATE
Shared: 2D Platformer · Shooter · Arcade