Games like Rhythium
Games like Rhythium include Muse Dash, DJMAX RESPECT V, Rhythm Doctor, Touhou Mystia's Izakaya, and A Dance of Fire and Ice. We matched them by the tags players give Rhythium on Steam (Casual, Simulation, Rhythm, 2D, and Anime): closest matches first, and among equally close ones the better-known games.

Muse Dash
Shared: Rhythm · Anime · Casual

DJMAX RESPECT V
Shared: Casual · Rhythm · Anime

Rhythm Doctor
Shared: Rhythm · Pixel Graphics · Indie

Touhou Mystia's Izakaya
Shared: Casual · Simulation · Pixel Graphics

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

Papers, Please
Shared: Simulation · Indie · Pixel Graphics

MUSYNX
Shared: Casual · Anime · Rhythm

Game Dev Tycoon
Shared: Simulation · Casual · Indie

Potion Craft: Alchemist Simulator
Shared: Simulation · 2D · Indie

Geometry Dash
Shared: 2D · Rhythm · Indie

Stardew Valley
Shared: Simulation · Pixel Graphics · Indie

Vampire Survivors
Shared: 2D · Pixel Graphics · Casual

Plague Inc: Evolved
Shared: Simulation · Casual · Indie

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Simulation

Cookie Clicker
Shared: Casual · Indie · Pixel Graphics

Montaro
Shared: Casual · Anime · Indie

Passpartout: The Starving Artist
Shared: Casual · Simulation · Indie

Incredibox
Shared: Casual · Rhythm · 2D

People Playground
Shared: 2D · Simulation · Singleplayer

Peace, Death!
Shared: Casual · Simulation · Indie

VA-11 Hall-A: Cyberpunk Bartender Action
Shared: Cyberpunk · Pixel Graphics · Casual

Timberman
Shared: Casual · Indie · 2D

Chinese Parents
Shared: Simulation · Casual · Indie

Melatonin
Shared: Rhythm · Indie · Hand-drawn