Games like Monkey Slap
Games like Monkey Slap include Rogue Legacy 2, Hollow Knight, Dust: An Elysian Tail, LIMBO, and Ori and the Will of the Wisps. We matched them by the tags players give Monkey Slap on Steam (Adventure, Indie, RPG, Platformer, and Action): closest matches first, and among equally close ones the better-known games.

Rogue Legacy 2
Shared: Platformer · Indie · Adventure

Hollow Knight
Shared: Platformer · Indie · 2D

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

LIMBO
Shared: Indie · Platformer · Adventure

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

SANABI
Shared: Adventure · Action · Indie

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

Dungeon Munchies
Shared: Indie · Adventure · Action

ICEY
Shared: Action · Adventure · Indie

Rogue Legacy
Shared: Indie · Platformer · Action

GRIS
Shared: Indie · Adventure · Atmospheric

Mark of the Ninja
Shared: Indie · Platformer · Adventure

Deadlight
Shared: Indie · Platformer · Adventure

Planet of Lana
Shared: Action · Adventure · Platformer

UnEpic
Shared: Indie · RPG · Platformer

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

Celeste
Shared: Indie · Platformer · Adventure

Monster Boy and the Cursed Kingdom
Shared: Adventure · Indie · Action

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Adventure

Trine 5: A Clockwork Conspiracy
Shared: Adventure · RPG · Action

Bloodstained: Ritual of the Night
Shared: RPG · Adventure · Action

MO:Astray
Shared: Indie · Adventure · Action

Zombotron
Shared: Adventure · Indie · Action

Eastern Exorcist
Shared: RPG · Adventure · Action

