Games like Rainbow Tap
Games like Rainbow Tap include Cookie Clicker, Melvor Idle, AudioSurf, Audiosurf 2, and Muse Dash. We matched them by the tags players give Rainbow Tap on Steam (Casual, Rhythm, Idler, Minimalist, and Funny): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Indie

Melvor Idle
Shared: Casual · Idler · Indie

AudioSurf
Shared: Rhythm · Casual · Indie

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

Muse Dash
Shared: Rhythm · Casual · Singleplayer

Incredibox
Shared: Casual · Rhythm · Music-Based Procedural Generation

Rhythm Doctor
Shared: Rhythm · Indie · Singleplayer

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

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

Trombone Champ
Shared: Rhythm · Funny · Casual

Keep on Mining!
Shared: Casual · Idler · Indie

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

Intralism
Shared: Rhythm · Indie · Casual

Little Inferno
Shared: Casual · Indie · Funny

Golf With Your Friends
Shared: Casual · Funny · Indie

Donut County
Shared: Casual · Funny · Indie

Hidden Folks
Shared: Casual · Indie · Funny

Garry's Mod
Shared: Casual · Funny · Singleplayer

Zup! X
Shared: Casual · Indie · Minimalist

Zup! S
Shared: Casual · Indie · Minimalist

A Game About Feeding A Black Hole
Shared: Casual · Idler · Indie

Mini Motorways
Shared: Casual · Minimalist · Indie

Gang Beasts
Shared: Funny · Casual · Singleplayer

Super Hexagon
Shared: Rhythm · Indie · Minimalist