Games like Super Muscle Knight
Games like Super Muscle Knight include Celeste, Super Meat Boy, Jump King, Geometry Dash, and VVVVVV. We matched them by the tags players give Super Muscle Knight on Steam (Precision Platformer, Difficult, Pixel Graphics, Psychological Horror, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Difficult · Pixel Graphics

Super Meat Boy
Shared: Precision Platformer · Difficult · Platformer

Jump King
Shared: Difficult · Precision Platformer · Psychological Horror

Geometry Dash
Shared: Difficult · Precision Platformer · 2D

VVVVVV
Shared: Precision Platformer · Pixel Graphics · Platformer

SANABI
Shared: Pixel Graphics · 2D Platformer · Difficult

Momodora: Reverie Under The Moonlight
Shared: Pixel Graphics · 2D Platformer · Side Scroller

Rain World
Shared: Difficult · Pixel Graphics · Platformer

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

Downwell
Shared: Precision Platformer · Pixel Graphics · Platformer

Bread & Fred
Shared: Pixel Graphics · Difficult · Precision Platformer

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Platformer

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

Hollow Knight
Shared: Difficult · Platformer · 2D

Blasphemous 2
Shared: Difficult · Pixel Graphics · 2D Platformer

Katana ZERO
Shared: Pixel Graphics · Platformer · 2D Platformer

Webbed
Shared: Pixel Graphics · 2D Platformer · Cute

Skul: The Hero Slayer
Shared: Pixel Graphics · Difficult · Platformer

Getting Over It with Bennett Foddy
Shared: Difficult · Psychological Horror · Platformer

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

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

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

Broforce
Shared: Pixel Graphics · Platformer · 2D

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