Games like MelodyJourney
Games like MelodyJourney include Muse Dash, Geometry Dash, A Dance of Fire and Ice, DJMAX RESPECT V, and Rhythm Doctor. We matched them by the tags players give MelodyJourney on Steam (Rhythm, Music, Casual, 2D, and Indie): closest matches first, and among equally close ones the better-known games.

Muse Dash
Shared: Rhythm · Music · Casual

Geometry Dash
Shared: Music · Rhythm · 2D

A Dance of Fire and Ice
Shared: Rhythm · Music · Indie

DJMAX RESPECT V
Shared: Rhythm · Music · Casual

Rhythm Doctor
Shared: Rhythm · Music · Indie

Incredibox
Shared: Rhythm · Casual · Music

Trombone Champ
Shared: Rhythm · Music · Casual

Neon Beats
Shared: Rhythm · Music · Indie

AudioSurf
Shared: Rhythm · Music · Casual

Melvor Idle
Shared: Casual · Indie · 2D

Melatonin
Shared: Rhythm · Indie · Music

Just Shapes & Beats
Shared: Rhythm · Music · 2D

Beat Saber
Shared: Rhythm · Music · Singleplayer

MUSYNX
Shared: Music · Rhythm · Casual

Audiosurf 2
Shared: Rhythm · Music · Indie

Rift of the NecroDancer
Shared: Rhythm · Music · Indie

Spin Rhythm XD
Shared: Rhythm · Music · Casual

Zup! S
Shared: Casual · 2D · Indie

Music Racer
Shared: Rhythm · Music · Indie

Super Hexagon
Shared: Indie · Rhythm · Music

Intralism
Shared: Rhythm · Music · Indie

One Hand Clapping
Shared: Music · Rhythm · Casual

140
Shared: Rhythm · Music · Indie

Cookie Clicker
Shared: Casual · Incremental · Indie