Games like Catch Flex
Games like Catch Flex include Beat Saber, A Dance of Fire and Ice, Geometry Dash, Intralism, and Rhythm Doctor. We matched them by the tags players give Catch Flex on Steam (Music, Rhythm, Fast-Paced, Sports, and Family Friendly): closest matches first, and among equally close ones the better-known games.

Beat Saber
Shared: Rhythm · Music · Fast-Paced

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

Geometry Dash
Shared: Music · Rhythm · Indie

Intralism
Shared: Music · Rhythm · Fast-Paced

Rhythm Doctor
Shared: Music · Rhythm · Indie

Spin Rhythm XD
Shared: Music · Rhythm · Indie

EZ2ON REBOOT : R
Shared: Rhythm · Music · Sports

Hatsune Miku: Project DIVA Mega Mix+
Shared: Rhythm · Music · Family Friendly

OhShape
Shared: Rhythm · Music · Sports

Just Shapes & Beats
Shared: Rhythm · Music · Indie

Thumper
Shared: Rhythm · Music · Indie

Synth Riders
Shared: Rhythm · Music · VR

DJMAX RESPECT V
Shared: Music · Rhythm · Action

AudioSurf
Shared: Music · Rhythm · Indie

Super Hexagon
Shared: Fast-Paced · Rhythm · Indie

Muse Dash
Shared: Music · Rhythm · Casual

Pistol Whip
Shared: Rhythm · VR · Music

BOXVR
Shared: Sports · Rhythm · Music

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

Ragnarock
Shared: Rhythm · Music · Action

PowerBeatsVR - VR Fitness
Shared: Sports · Rhythm · Music

Music Racer
Shared: Music · Rhythm · Indie

Rift of the NecroDancer
Shared: Music · Rhythm · Indie

Audiosurf 2
Shared: Music · Rhythm · Indie