Games like Re:Flex
Games like Re:Flex include A Dance of Fire and Ice, Geometry Dash, Muse Dash, Super Hexagon, and Rift of the NecroDancer. We matched them by the tags players give Re:Flex on Steam (Flight, Rhythm, Colorful, Arcade, and Casual): closest matches first, and among equally close ones the better-known games.

A Dance of Fire and Ice
Shared: Rhythm · Level Editor · Singleplayer

Geometry Dash
Shared: Level Editor · Rhythm · Colorful

Muse Dash
Shared: Rhythm · Casual · Colorful

Super Hexagon
Shared: Arcade · Rhythm · Indie

Rift of the NecroDancer
Shared: Rhythm · Arcade · Colorful

Rhythm Doctor
Shared: Rhythm · Level Editor · Singleplayer

BARRIER X
Shared: Arcade · Colorful · Rhythm

Sayonara Wild Hearts
Shared: Rhythm · Casual · Arcade

DJMAX RESPECT V
Shared: Rhythm · Casual · Action

Spin Rhythm XD
Shared: Rhythm · Casual · Arcade

AudioSurf
Shared: Rhythm · Arcade · Casual

Project Wingman
Shared: Flight · Action · Arcade

Intralism
Shared: Rhythm · Level Editor · Arcade

Just Shapes & Beats
Shared: Rhythm · Action · Great Soundtrack

Music Racer
Shared: Rhythm · Colorful · Casual

Zuma's Revenge!
Shared: Casual · Singleplayer · Action

Melatonin
Shared: Rhythm · Colorful · Indie

Superflight
Shared: Flight · Casual · Indie

EZ2ON REBOOT : R
Shared: Rhythm · Casual · Action

Trailmakers
Shared: Flight · Action · Family Friendly

Timberman
Shared: Casual · Arcade · Action

pureya
Shared: Arcade · Colorful · Casual

Beatblock
Shared: Rhythm · Arcade · Level Editor

One Finger Death Punch
Shared: Action · Singleplayer · Indie