Games like Magic Smasher
Games like Magic Smasher include Celeste, Super Meat Boy, Geometry Dash, Downwell, and Spelunky 2. We matched them by the tags players give Magic Smasher on Steam (Precision Platformer, 2D Platformer, Roguelite, Perma Death, and Tutorial): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Difficult · 2D Platformer

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

Geometry Dash
Shared: Difficult · Precision Platformer · 2D

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

Spelunky 2
Shared: 2D Platformer · Platformer · Perma Death

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

Rogue Legacy 2
Shared: Roguelite · Arcade · Platformer

Caveblazers
Shared: Roguelite · 2D Platformer · Platformer

Braid
Shared: 2D Platformer · Platformer · 2D

Alex Kidd in Miracle World DX
Shared: Precision Platformer · 2D Platformer · Difficult

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Jump King
Shared: Precision Platformer · Difficult · Platformer

Vampire Survivors
Shared: Roguelite · 2D · Arcade

Spelunky
Shared: Platformer · Difficult · 2D

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

Thomas Was Alone
Shared: 2D Platformer · Precision Platformer · Platformer

Dungeon Escape
Shared: Precision Platformer · 2D Platformer · Difficult

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

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

Noita
Shared: Difficult · Perma Death · 2D

30XX
Shared: 2D Platformer · Roguelite · Perma Death

Ambidextro
Shared: Precision Platformer · 2D Platformer · Platformer

SANABI
Shared: 2D Platformer · 2D · Platformer

Rain World
Shared: Difficult · Platformer · 2D Platformer