Games like Slime-san: Superslime Edition
Games like Slime-san: Superslime Edition include Celeste, Super Meat Boy, Pizza Tower, Geometry Dash, and VVVVVV. We matched them by the tags players give Slime-san: Superslime Edition on Steam (Platformer, Precision Platformer, 2D Platformer, Difficult, and Funny): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Difficult · Platformer

Super Meat Boy
Shared: Platformer · Precision Platformer · Difficult

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Geometry Dash
Shared: Difficult · Precision Platformer · Platformer

VVVVVV
Shared: Precision Platformer · Platformer · 2D Platformer

Katana ZERO
Shared: Platformer · Action · 2D Platformer

Downwell
Shared: Precision Platformer · Platformer · Indie

SANABI
Shared: 2D Platformer · Action · Pixel Graphics

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

Hollow Knight
Shared: Platformer · Difficult · Indie

Jump King
Shared: Precision Platformer · Difficult · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Pixel Graphics

Hollow Knight: Silksong
Shared: Difficult · Indie · Platformer

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

The Messenger
Shared: Platformer · 2D Platformer · Indie

Pogostuck: Rage With Your Friends
Shared: Precision Platformer · Difficult · Platformer

Rogue Legacy 2
Shared: Platformer · Indie · Action

Angry Video Game Nerd Adventures
Shared: Platformer · Difficult · Indie

Cuphead
Shared: Platformer · Difficult · Indie

Electronic Super Joy
Shared: Platformer · Difficult · Indie

Out There Somewhere
Shared: Platformer · Indie · Pixel Graphics

Exit the Gungeon
Shared: Indie · Action · Adventure

Will You Snail?
Shared: Precision Platformer · Difficult · Platformer

Getting Over It with Bennett Foddy
Shared: Difficult · Platformer · Funny