Games like Slime Slayer
Games like Slime Slayer include SANABI, Dust: An Elysian Tail, Hollow Knight, Celeste, and Pizza Tower. We matched them by the tags players give Slime Slayer on Steam (2D Platformer, Platformer, Indie, 2D, and Casual): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: 2D Platformer · Action · 2D

Dust: An Elysian Tail
Shared: Platformer · Indie · Action

Hollow Knight
Shared: Platformer · 2D · Indie

Celeste
Shared: Indie · Platformer · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Indie · Platformer

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

Skul: The Hero Slayer
Shared: Indie · Action · 2D

BEEP
Shared: Platformer · Indie · 2D

Katana ZERO
Shared: Platformer · Action · 2D Platformer

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

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

Sonic Superstars
Shared: Platformer · 2D Platformer · Action

Super Fancy Pants Adventure
Shared: Indie · Platformer · Action

Rogue Legacy
Shared: Platformer · Indie · Action

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

Sonic Origins
Shared: 2D Platformer · Action · Platformer

Owlboy
Shared: Indie · Platformer · 2D

Brawlhalla
Shared: 2D Platformer · Platformer · Casual

Ori and the Will of the Wisps
Shared: Platformer · Action · Singleplayer

Mark of the Ninja
Shared: Platformer · Indie · 2D

Rogue Legacy 2
Shared: Platformer · Indie · Action

Minimalism
Shared: Indie · Platformer · Casual

LIMBO
Shared: Indie · Platformer · 2D

Gravity Circuit
Shared: Platformer · Indie · Action