Games like Uncolor
Games like Uncolor include Celeste, Super Meat Boy, Geometry Dash, Hollow Knight, and Hollow Knight: Silksong. We matched them by the tags players give Uncolor on Steam (Precision Platformer, Difficult, Platformer, 2D, and Adventure): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Difficult · Platformer

Super Meat Boy
Shared: Precision Platformer · Difficult · Platformer

Geometry Dash
Shared: Difficult · Precision Platformer · 2D

Hollow Knight
Shared: Platformer · Difficult · 2D

Hollow Knight: Silksong
Shared: Difficult · 2D · Platformer

Jump King
Shared: Difficult · Precision Platformer · Platformer

VVVVVV
Shared: Precision Platformer · Platformer · Difficult

The End Is Nigh
Shared: Precision Platformer · Platformer · Difficult

SANABI
Shared: Adventure · 2D · Singleplayer

Rain World
Shared: Difficult · Platformer · 2D

Shovel Knight: Treasure Trove
Shared: Platformer · 2D · Difficult

Downwell
Shared: Precision Platformer · Platformer · Difficult

Cuphead
Shared: Difficult · Platformer · 2D

Alex Kidd in Miracle World DX
Shared: Precision Platformer · Difficult · Platformer

Super Meat Boy Forever
Shared: Difficult · Precision Platformer · Platformer

LIMBO
Shared: Platformer · Indie · 2D

Nine Sols
Shared: Difficult · 2D · Platformer

Volgarr the Viking
Shared: Difficult · Platformer · 2D

Dungeon Escape
Shared: Precision Platformer · Difficult · Platformer

Pizza Tower
Shared: Platformer · 2D Platformer · Indie

BEEP
Shared: Platformer · 2D · Adventure

Pogostuck: Rage With Your Friends
Shared: Difficult · Precision Platformer · Platformer

Rogue Legacy 2
Shared: Platformer · Difficult · Adventure

A Difficult Game About Climbing
Shared: Difficult · Precision Platformer · Platformer