Games like The Sword and the Slime
Games like The Sword and the Slime include Celeste, INMOST, MO:Astray, The Binding of Isaac: Rebirth, and FEZ. We matched them by the tags players give The Sword and the Slime on Steam (Indie, Pixel Graphics, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Pixel Graphics · Indie · Puzzle Platformer

INMOST
Shared: Indie · Pixel Graphics · Puzzle Platformer

MO:Astray
Shared: Indie · Pixel Graphics · Puzzle Platformer

The Binding of Isaac: Rebirth
Shared: Indie · Pixel Graphics

FEZ
Shared: Indie · Pixel Graphics · Puzzle Platformer

Papers, Please
Shared: Indie · Pixel Graphics

Iconoclasts
Shared: Indie · Pixel Graphics · Puzzle Platformer

ANIMAL WELL
Shared: Pixel Graphics · Puzzle Platformer · Indie

OneShot
Shared: Pixel Graphics · Indie

Webbed
Shared: Pixel Graphics · Puzzle Platformer · Indie

LIMBO
Shared: Indie · Puzzle Platformer

Skul: The Hero Slayer
Shared: Indie · Pixel Graphics

Squishy the Suicidal Pig
Shared: Indie · Puzzle Platformer · Pixel Graphics

HAAK
Shared: Pixel Graphics · Puzzle Platformer · Indie

OMORI
Shared: Indie · Pixel Graphics

Out There Somewhere
Shared: Pixel Graphics · Indie · Puzzle Platformer

Stardew Valley
Shared: Pixel Graphics · Indie

Owlboy
Shared: Pixel Graphics · Indie · Puzzle Platformer

Vampire Survivors
Shared: Pixel Graphics · Indie

I hate this game
Shared: Indie · Pixel Graphics · Puzzle Platformer

Hotline Miami
Shared: Indie · Pixel Graphics

To the Moon
Shared: Indie · Pixel Graphics

CATO: Buttered Cat
Shared: Puzzle Platformer · Pixel Graphics · Indie

Reventure
Shared: Indie · Pixel Graphics · Puzzle Platformer