Games like Cosmophage
Games like Cosmophage include Celeste, Super Meat Boy, Downwell, Bit Blaster XL, and VVVVVV. We matched them by the tags players give Cosmophage on Steam (Bullet Hell, Shoot 'Em Up, Precision Platformer, 2D Platformer, and Nonlinear): closest matches first, and among equally close ones the better-known games.
Celeste
Shared: Precision Platformer · 2D Platformer · Platformer
Super Meat Boy
Shared: Precision Platformer · 2D Platformer · Platformer
Downwell
Shared: Precision Platformer · 2D Platformer · Platformer
Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · 2D
VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer
Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade
LUFTRAUSERS
Shared: Bullet Hell · Shoot 'Em Up · 2D
Huntdown
Shared: Shoot 'Em Up · Action · 2D
Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics
Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Twin Stick Shooter
BALL x PIT
Shared: Bullet Hell · Shoot 'Em Up · Action
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Action
Bleed 2
Shared: Shoot 'Em Up · Bullet Hell · Action
Rise & Shine
Shared: Bullet Hell · 2D Platformer · Shoot 'Em Up
Enter the Gungeon
Shared: Bullet Hell · Twin Stick Shooter · Pixel Graphics
Katana ZERO
Shared: 2D Platformer · Platformer · Action
Warhammer 40,000: Shootas, Blood & Teef
Shared: Shoot 'Em Up · Bullet Hell · 2D Platformer
Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · Action
SANABI
Shared: 2D Platformer · Action · 2D
Exit the Gungeon
Shared: Bullet Hell · 2D Platformer · Action
Leap Year
Shared: Precision Platformer · 2D Platformer · Platformer
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Action
Himno
Shared: Platformer · 2D · 2D Platformer
Ambidextro
Shared: Precision Platformer · 2D Platformer · Platformer