Games like The Forgotten Isles
Games like The Forgotten Isles include Portal 2, VHOLUME, A Story About My Uncle, Refunct, and Mirror's Edge™. We matched them by the tags players give The Forgotten Isles on Steam (First-Person, Singleplayer, Atmospheric, Racing, and Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Singleplayer · First-Person · Platformer

VHOLUME
Shared: First-Person · Atmospheric · Platformer

A Story About My Uncle
Shared: First-Person · Singleplayer · Atmospheric

Refunct
Shared: First-Person · 3D Platformer · Atmospheric

Mirror's Edge™
Shared: First-Person · Singleplayer · Platformer

Mirror's Edge™ Catalyst
Shared: First-Person · Runner · 3D Platformer

Need for Speed™ Heat
Shared: Racing · Singleplayer · Atmospheric

Portal
Shared: First-Person · Singleplayer · 3D Platformer

Firewatch
Shared: Atmospheric · First-Person · Singleplayer

Haste
Shared: Singleplayer · Racing · 3D Platformer

Grand Theft Auto V Legacy
Shared: First-Person · Singleplayer · Racing

Outlast
Shared: First-Person · Atmospheric · Singleplayer

White Knuckle
Shared: First-Person · Platformer · Atmospheric

Viewfinder
Shared: First-Person · Singleplayer · Atmospheric

Ori and the Will of the Wisps
Shared: Singleplayer · Platformer · Atmospheric

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Singleplayer · Platformer · Racing

Fallout 4
Shared: Singleplayer · Atmospheric · First-Person

Need for Speed™ Unbound
Shared: Racing · Singleplayer · Controller

Neon White
Shared: Platformer · 3D Platformer · Singleplayer

Valley
Shared: First-Person · Singleplayer · Atmospheric

Clustertruck
Shared: First-Person · Singleplayer · 3D Platformer

BioShock Infinite
Shared: First-Person · Singleplayer · Atmospheric

Slime Rancher 2
Shared: Singleplayer · First-Person · Casual

Forza Horizon 5
Shared: Racing · First-Person · Adventure