Games like MusicHell
Games like MusicHell include Just Shapes & Beats, A Dance of Fire and Ice, Geometry Dash, Among Us, and Beat Hazard. We matched them by the tags players give MusicHell on Steam (Bullet Hell, Rhythm, Multiplayer, Arcade, and Party Game): closest matches first, and among equally close ones the better-known games.

Just Shapes & Beats
Shared: Rhythm · Bullet Hell · Multiplayer

A Dance of Fire and Ice
Shared: Rhythm · Arcade · 2D

Geometry Dash
Shared: Rhythm · 2D · Level Editor

Among Us
Shared: Multiplayer · 2D · Party Game

Beat Hazard
Shared: Rhythm · Bullet Hell · 2D

DJMAX RESPECT V
Shared: Rhythm · Multiplayer · Action

Afterbeat (Project Arrhythmia)
Shared: Bullet Hell · Rhythm · 2D

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

Enter the Gungeon
Shared: Bullet Hell · Multiplayer · 2D

Rhythm Doctor
Shared: Rhythm · 2D · Action

Spin Rhythm XD
Shared: Rhythm · Multiplayer · Arcade

Rift of the NecroDancer
Shared: Rhythm · Arcade · Action

BALL x PIT
Shared: Bullet Hell · Arcade · Action

The Spell Brigade
Shared: Bullet Hell · Multiplayer · Online Co-Op

MECCHA CHAMELEON
Shared: Multiplayer · Party Game · Colorful

Crab Champions
Shared: Multiplayer · Arcade · Bullet Hell

ShellShock Live
Shared: Multiplayer · 2D · Action

Cuphead
Shared: Multiplayer · 2D · Bullet Hell

Intralism
Shared: Rhythm · Multiplayer · Arcade

Streets of Rage 4
Shared: Arcade · 2D · Action

Need for Speed™ Heat
Shared: Multiplayer · Arcade · Action

Risk of Rain Returns
Shared: Multiplayer · 2D · Arcade

Move or Die
Shared: Multiplayer · 2D · Action

skate.
Shared: Multiplayer · Controller · Action