Games like Piano Children
Games like Piano Children include A Dance of Fire and Ice, AudioSurf, Geometry Dash, Music Racer, and Beat Saber. We matched them by the tags players give Piano Children on Steam (Music-Based Procedural Generation, Education, Party Game, Family Friendly, and Rhythm): closest matches first, and among equally close ones the better-known games.

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

AudioSurf
Shared: Music-Based Procedural Generation · Rhythm · Music

Geometry Dash
Shared: Music · Rhythm · Singleplayer

Music Racer
Shared: Music-Based Procedural Generation · Rhythm · Music

Beat Saber
Shared: Rhythm · Music · Music-Based Procedural Generation

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

Muse Dash
Shared: Rhythm · Music · Singleplayer

Incredibox
Shared: Rhythm · Music · Family Friendly

Audiosurf 2
Shared: Music-Based Procedural Generation · Rhythm · Music

Melody's Escape
Shared: Music-Based Procedural Generation · Rhythm · Colorful

Rhythm Doctor
Shared: Rhythm · Music · Singleplayer

Beat Hazard
Shared: Music-Based Procedural Generation · Rhythm · Music

Sayonara Wild Hearts
Shared: Rhythm · Music · Action

DJMAX RESPECT V
Shared: Rhythm · Music · Action

Melatonin
Shared: Rhythm · Colorful · Music

Spin Rhythm XD
Shared: Rhythm · Music · Indie

EZ2ON REBOOT : R
Shared: Rhythm · Music · Action

Trombone Champ
Shared: Rhythm · Music · Colorful

Hi-Fi RUSH
Shared: Rhythm · Action · Singleplayer

Rift of the NecroDancer
Shared: Rhythm · Music · Colorful

Intralism
Shared: Rhythm · Music · Music-Based Procedural Generation

Just Shapes & Beats
Shared: Rhythm · Music · Action

Rocksmith+
Shared: Education · Music · Rhythm

One Hand Clapping
Shared: Rhythm · Music · Family Friendly