Games like Project DevourSlime
Games like Project DevourSlime include Celeste, Super Meat Boy, SANABI, VVVVVV, and Webbed. We matched them by the tags players give Project DevourSlime on Steam (Platformer, 2D Platformer, Precision Platformer, Puzzle Platformer, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · Pixel Graphics

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

SANABI
Shared: Pixel Graphics · 2D Platformer · Action

VVVVVV
Shared: Platformer · Precision Platformer · Pixel Graphics

Webbed
Shared: 2D Platformer · Pixel Graphics · Puzzle Platformer

Portal 2
Shared: Platformer · Puzzle · Puzzle Platformer

Katana ZERO
Shared: Platformer · Pixel Graphics · Action

Leap Year
Shared: 2D Platformer · Precision Platformer · Puzzle Platformer

Planet of Lana
Shared: Puzzle Platformer · 2D Platformer · Action

LIMBO
Shared: Platformer · Puzzle Platformer · Puzzle

Downwell
Shared: Precision Platformer · Platformer · Pixel Graphics

Out There Somewhere
Shared: Platformer · Pixel Graphics · Puzzle

Pizza Tower
Shared: 2D Platformer · Platformer · Pixel Graphics

Öoo
Shared: 2D Platformer · Puzzle Platformer · Platformer

ANIMAL WELL
Shared: Platformer · Puzzle Platformer · Pixel Graphics

Braid
Shared: 2D Platformer · Puzzle Platformer · Platformer

I wanna be the Creator
Shared: Platformer · Action · Precision Platformer

ElecHead
Shared: Platformer · Puzzle Platformer · Pixel Graphics

FEZ
Shared: Platformer · Pixel Graphics · Puzzle

Trine 2: Complete Story
Shared: Platformer · Puzzle Platformer · 2D Platformer

Jump King
Shared: Precision Platformer · Platformer · Pixel Graphics

Defy Gravity Extended
Shared: Platformer · Puzzle Platformer · Puzzle

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · Platformer

Owlboy
Shared: Platformer · Pixel Graphics · Puzzle Platformer