Games like Reflex This!
Games like Reflex This! include DJMAX RESPECT V, A Dance of Fire and Ice, AudioSurf, Hatsune Miku: Project DIVA Mega Mix+, and Super Hexagon. We matched them by the tags players give Reflex This! on Steam (Action, Casual, Arcade, Puzzle, and Rhythm): closest matches first, and among equally close ones the better-known games.

DJMAX RESPECT V
Shared: Casual · Action · Rhythm

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

AudioSurf
Shared: Casual · Rhythm · Arcade

Hatsune Miku: Project DIVA Mega Mix+
Shared: Arcade · Rhythm · Action

Super Hexagon
Shared: Arcade · Rhythm · Action

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

Spin Rhythm XD
Shared: Casual · Rhythm · Action

EZ2ON REBOOT : R
Shared: Action · Casual · Rhythm

Sayonara Wild Hearts
Shared: Action · Rhythm · Casual

LUMINES REMASTERED
Shared: Casual · Puzzle · Action

Music Racer
Shared: Action · Rhythm · Casual

Timberman
Shared: Casual · Action · Arcade

Sixtar Gate: STARTRAIL
Shared: Action · Casual · Arcade

Waveform
Shared: Casual · Puzzle · Arcade

MULLET MADJACK
Shared: Action · Arcade · Cyberpunk

Rhythm Doctor
Shared: Rhythm · Action · Indie

Audiosurf 2
Shared: Rhythm · Casual · Arcade

MUSYNX
Shared: Casual · Rhythm · Arcade

SUPERHOT
Shared: Action · Puzzle · Indie

Vampire Survivors
Shared: Casual · Action · Arcade

Dead as Disco
Shared: Rhythm · Action · Arcade

Puyo Puyo™ Tetris® 2
Shared: Casual · Action · Puzzle

Megabonk
Shared: Action · Indie · Arcade

MARVEL Tōkon: Fighting Souls
Shared: Action · Casual · Arcade