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

Muse Dash
Shared: Music · Rhythm · Cute

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

Geometry Dash
Shared: Music · 2D · Rhythm

Melatonin
Shared: Indie · Rhythm · Music

AudioSurf
Shared: Music · Indie · Rhythm

DJMAX RESPECT V
Shared: Music · Rhythm · Casual

Rhythm Doctor
Shared: Music · Rhythm · Indie

Rift of the NecroDancer
Shared: Music · Indie · Rhythm

Florence
Shared: Indie · Casual · Cute

Slime Rancher 2
Shared: Cute · Colorful · Singleplayer

Incredibox
Shared: Casual · Music · Rhythm

Trombone Champ
Shared: Rhythm · Music · Casual

Ratatan
Shared: Indie · Music · Rhythm

Sayonara Wild Hearts
Shared: Music · Rhythm · Casual

Cat Goes Fishing
Shared: Indie · 2D · Casual

Assemble with Care
Shared: Indie · Casual · Female Protagonist

One Hand Clapping
Shared: Indie · Music · Casual

Zup! S
Shared: Indie · Casual · 2D

Just Shapes & Beats
Shared: Music · Rhythm · Indie

Unpacking
Shared: Casual · Cute · Indie

MOMO Crash
Shared: Music · Rhythm · Casual

Spin Rhythm XD
Shared: Music · Indie · Rhythm

Audiosurf 2
Shared: Music · Indie · Rhythm

Music Racer
Shared: Music · Indie · Rhythm