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

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

Muse Dash
Shared: Music · Rhythm · Casual

Rhythm Doctor
Shared: Music · Rhythm · Indie

DJMAX RESPECT V
Shared: Casual · Music · Rhythm

Spin Rhythm XD
Shared: Casual · Indie · Music

Music Racer
Shared: Indie · Music · Rhythm

AudioSurf
Shared: Indie · Music · Casual

Sayonara Wild Hearts
Shared: Action · Music · Rhythm

Beat Saber
Shared: Music · Rhythm · Indie

Intralism
Shared: Indie · Music · Rhythm

Geometry Dash
Shared: Music · Rhythm · Indie

EZ2ON REBOOT : R
Shared: Action · Casual · Rhythm

Audiosurf 2
Shared: Indie · Music · Rhythm

Just Shapes & Beats
Shared: Rhythm · Music · Indie

Ragnarock
Shared: Action · Rhythm · Music

BOXVR
Shared: Indie · Casual · Action

Rift of the NecroDancer
Shared: Indie · Music · Rhythm

Frederic: Resurrection of Music
Shared: Indie · Casual · Music

Retrowave
Shared: Indie · Casual · Action

Slash It 2
Shared: Indie · Casual · Action

MUSYNX
Shared: Indie · Music · Casual

Symphony
Shared: Indie · Music · Action

BIT.TRIP BEAT
Shared: Indie · Action · Music

Thumper
Shared: Indie · Action · Rhythm