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

Muse Dash
Shared: Music · Rhythm · Anime

MUSYNX
Shared: Music · Indie · Casual

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

DJMAX RESPECT V
Shared: Casual · Music · Rhythm

AudioSurf
Shared: Indie · Music · Casual

Rhythm Doctor
Shared: Music · Rhythm · Indie

Intralism
Shared: Indie · Music · Rhythm

Audiosurf 2
Shared: Indie · Music · Rhythm

Spin Rhythm XD
Shared: Casual · Music · Indie

Music Racer
Shared: Indie · Music · Rhythm

Geometry Dash
Shared: Music · Rhythm · Indie

Beat Saber
Shared: Music · Rhythm · Indie

KAMITSUBAKI CITY ENSEMBLE
Shared: Music · Rhythm · Casual

AVICII Invector
Shared: Indie · Casual · Music

Montaro
Shared: Casual · Indie · Anime

Incredibox
Shared: Casual · Music · Rhythm

Ratatan
Shared: Indie · Music · Anime

EZ2ON REBOOT : R
Shared: Rhythm · Music · Casual

Sixtar Gate: STARTRAIL
Shared: Casual · Rhythm · Indie

Sayonara Wild Hearts
Shared: Music · Rhythm · Casual

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

KALPA: Cosmic Symphony
Shared: Casual · Music · Rhythm

Hextech Mayhem: A League of Legends Story™
Shared: Music · Rhythm · Runner

Just Shapes & Beats
Shared: Rhythm · Music · Indie