Games like Grey Phobia
Games like Grey Phobia include Bastion, Fallout 4, Metro Exodus, Hyper Light Drifter, and Seen. We matched them by the tags players give Grey Phobia on Steam (Early Access, Action, Indie, Post-apocalyptic, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Bastion
Shared: Action · Indie · Great Soundtrack

Fallout 4
Shared: Post-apocalyptic · Singleplayer · Atmospheric

Metro Exodus
Shared: Post-apocalyptic · Singleplayer · Action

Hyper Light Drifter
Shared: Indie · Atmospheric · Action

Seen
Shared: Indie · Singleplayer · Action

METRO 2033 Redux
Shared: Post-apocalyptic · Action · Atmospheric

METRO Last Light Redux
Shared: Post-apocalyptic · Action · Atmospheric

Caster
Shared: Action · Indie · Singleplayer

Deadlight
Shared: Action · Indie · Post-apocalyptic

Hades
Shared: Indie · Action · Singleplayer

Hollow Knight
Shared: Indie · Great Soundtrack · Singleplayer

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Singleplayer

Ori and the Will of the Wisps
Shared: Action · Singleplayer · Great Soundtrack

Hotline Miami
Shared: Action · Indie · Great Soundtrack

Dome Keeper
Shared: Action · Post-apocalyptic · Singleplayer

GRIS
Shared: Indie · Atmospheric · Great Soundtrack

FAR: Lone Sails
Shared: Post-apocalyptic · Atmospheric · Singleplayer

Mafia II (Classic)
Shared: Action · Singleplayer · Atmospheric

DOOM Eternal
Shared: Action · Great Soundtrack · Singleplayer

NieR Replicant™ ver.1.22474487139...
Shared: Action · Great Soundtrack · Singleplayer

Black Mesa
Shared: Action · Singleplayer · Atmospheric

ENDER LILIES: Quietus of the Knights
Shared: Singleplayer · Great Soundtrack · Atmospheric

Superflight
Shared: Indie · Action · Atmospheric

Grand Theft Auto V Legacy
Shared: Action · Singleplayer · Third-Person Shooter

