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

Geometry Dash
Shared: Music · Rhythm · Level Editor

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

Rhythm Doctor
Shared: Rhythm · Music · Indie

Muse Dash
Shared: Rhythm · Music · Casual

DJMAX RESPECT V
Shared: Rhythm · Music · Casual

Just Shapes & Beats
Shared: Rhythm · Music · Indie

Incredibox
Shared: Rhythm · Music · Casual

Intralism
Shared: Rhythm · Music · Indie

Beat Saber
Shared: Rhythm · Music · Action

Beatblock
Shared: Rhythm · Music · Tutorial

Sayonara Wild Hearts
Shared: Rhythm · Music · Action

Rift of the NecroDancer
Shared: Rhythm · Music · Indie

Spin Rhythm XD
Shared: Rhythm · Music · Indie

Music Racer
Shared: Rhythm · Music · Indie

AudioSurf
Shared: Rhythm · Music · Indie

Melatonin
Shared: Rhythm · Indie · Music

EZ2ON REBOOT : R
Shared: Rhythm · Music · Action

Audiosurf 2
Shared: Rhythm · Music · Indie

Rocksmith® 2014 Edition REMASTERED LEARN & PLAY
Shared: Music · Rhythm · Tutorial

Hi-Fi RUSH
Shared: Rhythm · Action · Music

Super Hexagon
Shared: Indie · Rhythm · Action

MUSYNX
Shared: Music · Rhythm · Indie

Neon Beats
Shared: Rhythm · Music · Indie

Sixtar Gate: STARTRAIL
Shared: Rhythm · Action · Casual