Games like Colorize
Games like Colorize include Vampire Survivors, Skul: The Hero Slayer, Rogue Legacy, Megabonk, and Dead Cells. We matched them by the tags players give Colorize on Steam (Action, Platformer, Roguelike, 2D Platformer, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Skul: The Hero Slayer
Shared: Action · Roguelike · Action Roguelike

Rogue Legacy
Shared: Platformer · Roguelike · Action

Megabonk
Shared: Roguelike · Action Roguelike · Action

Dead Cells
Shared: Roguelike · Action Roguelike · Platformer

Risk of Rain (2013)
Shared: Roguelike · Platformer · Action

Dungreed
Shared: Roguelike · Action · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelike · Bullet Hell

BALL x PIT
Shared: Action · Roguelike · Bullet Hell

Downwell
Shared: Platformer · Action Roguelike · Precision Platformer

Enter the Gungeon
Shared: Roguelike · Action Roguelike · Bullet Hell

Death Must Die
Shared: Action Roguelike · Bullet Hell · Action

Nuclear Throne
Shared: Roguelike · Action Roguelike · Action

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

Caveblazers
Shared: Platformer · Action Roguelike · Roguelike

Hades
Shared: Action Roguelike · Action · Roguelike

Celeste
Shared: Platformer · Precision Platformer · 2D Platformer

20XX
Shared: Platformer · Action · Action Roguelike

The Binding of Isaac: Rebirth
Shared: Roguelike · Action Roguelike · Indie

ScourgeBringer
Shared: Action · Roguelike · Action Roguelike

BlazBlue Entropy Effect
Shared: Action · Action Roguelike · Platformer

30XX
Shared: 2D Platformer · Action Roguelike · Platformer

Anomaly Agent
Shared: 2D Platformer · Platformer · Action Roguelike

Atomicrops
Shared: Action · Roguelike · Bullet Hell