Games like Polychromatic
Games like Polychromatic include Bastion, UBERMOSH, Super Hexagon, Hotline Miami, and RUINER. We matched them by the tags players give Polychromatic on Steam (Indie, Action, Twin Stick Shooter, Arena Shooter, and Colorful): closest matches first, and among equally close ones the better-known games.

Bastion
Shared: Indie · Action · Great Soundtrack

UBERMOSH
Shared: Action · Indie · Great Soundtrack

Super Hexagon
Shared: Indie · Great Soundtrack · Arcade

Hotline Miami
Shared: Action · Indie · Great Soundtrack

RUINER
Shared: Action · Indie · Great Soundtrack

Nex Machina
Shared: Twin Stick Shooter · Action · Indie

Rift of the NecroDancer
Shared: Indie · Action · Arcade

Pizza Tower
Shared: Indie · Great Soundtrack · Action

Streets of Rage 4
Shared: Action · Indie · Arcade

Project Wingman
Shared: Action · Indie · Arcade

Geometry Dash
Shared: Great Soundtrack · Indie · Colorful

Century: Age of Ashes
Shared: Action · Indie · Free to Play

Sayonara Wild Hearts
Shared: Action · Great Soundtrack · Colorful

Relic Hunters Zero: Remix
Shared: Action · Twin Stick Shooter · Free to Play

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

Hades
Shared: Indie · Action · Great Soundtrack

Windowkill
Shared: Indie · Action · Twin Stick Shooter

BARRIER X
Shared: Indie · Action · Arcade

The Mean Greens - Plastic Warfare
Shared: Action · Indie · Great Soundtrack

Katana ZERO
Shared: Action · Great Soundtrack · Indie

Slapshot: Rebound
Shared: Action · Arcade · Free to Play

Lethal League Blaze
Shared: Indie · Action · Great Soundtrack

Cyberhunt
Shared: Indie · Action · Twin Stick Shooter

Hyper Light Drifter
Shared: Indie · Great Soundtrack · Action

