Games like Slimper
Games like Slimper include Celeste, Geometry Dash, Super Meat Boy, Jump King, and SANABI. We matched them by the tags players give Slimper on Steam (Precision Platformer, Action, 2D Platformer, Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Geometry Dash
Shared: Precision Platformer · 2D · Platformer

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

Jump King
Shared: Precision Platformer · Psychological Horror · Platformer

SANABI
Shared: Action · 2D Platformer · 2D

Hollow Knight
Shared: Platformer · 2D · Indie

Downwell
Shared: Precision Platformer · Platformer · 2D Platformer

Sonic Superstars
Shared: Action · 2D Platformer · Platformer

VVVVVV
Shared: Precision Platformer · Platformer · 2D Platformer

Laughing to Die
Shared: Platformer · 2D Platformer · Adventure

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Sonic the Hedgehog 4 Episode 1
Shared: Action · Platformer · 2D

Super Fancy Pants Adventure
Shared: Action · Platformer · Adventure

Pogostuck: Rage With Your Friends
Shared: Precision Platformer · Psychological Horror · Platformer

Katana ZERO
Shared: Action · Platformer · 2D Platformer

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

GRIS
Shared: Platformer · Hand-drawn · Adventure

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

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

Sonic Origins
Shared: Action · 2D Platformer · Platformer

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

Nine Sols
Shared: Action · Platformer · 2D

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

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