Games like Radium
Games like Radium include Minimalism, Super Hexagon, Timberman, SUPERHOT, and Linea, the Game. We matched them by the tags players give Radium on Steam (Indie, Casual, Action, Difficult, and Minimalist): closest matches first, and among equally close ones the better-known games.

Minimalism
Shared: Indie · Casual · Action

Super Hexagon
Shared: Indie · Difficult · Action

Timberman
Shared: Casual · Indie · Action

SUPERHOT
Shared: Action · Indie · Minimalist

Linea, the Game
Shared: Indie · Casual · Difficult

Hotline Miami
Shared: Indie · Action · Difficult

WAVESHAPER
Shared: Casual · Indie · Action

Zup! S
Shared: Casual · Indie · Minimalist

A Dance of Fire and Ice
Shared: Difficult · Indie · Casual

Baba Is You
Shared: Indie · Difficult · Minimalist

Intralism
Shared: Indie · Difficult · Casual

Spin Rhythm XD
Shared: Casual · Indie · Difficult

Skul: The Hero Slayer
Shared: Indie · Action · Difficult

One Finger Death Punch
Shared: Action · Indie · Casual

Shio
Shared: Indie · Action · Casual

Duet
Shared: Indie · Action · Difficult

Dead Bits
Shared: Indie · Casual · Action

One Finger Death Punch 2
Shared: Indie · Action · Casual

Hollow Knight: Silksong
Shared: Indie · Difficult · Action

LYNE
Shared: Minimalist · Casual · Difficult

Hexcells Infinite
Shared: Casual · Indie · Minimalist

Bit Blaster XL
Shared: Difficult · Action · Casual

BIT.TRIP BEAT
Shared: Indie · Action · Casual

Getting Over It with Bennett Foddy
Shared: Difficult · Indie · Casual