Games like Unwell
Games like Unwell include SILENT HILL 2, Outlast, SILENT HILL f, Darkwood, and Little Nightmares. We matched them by the tags players give Unwell on Steam (Atmospheric, Psychological Horror, Adventure, Survival Horror, and Psychological): closest matches first, and among equally close ones the better-known games.

SILENT HILL 2
Shared: Psychological Horror · Atmospheric · Survival Horror

Outlast
Shared: Atmospheric · Survival Horror · Psychological Horror

SILENT HILL f
Shared: Psychological Horror · Survival Horror · Horror

Darkwood
Shared: Adventure · Psychological Horror · Survival Horror

Little Nightmares
Shared: Atmospheric · Adventure · Horror

Little Nightmares II
Shared: Adventure · Atmospheric · Horror

The Evil Within 2
Shared: Psychological Horror · Survival Horror · Horror

SOMA
Shared: Psychological Horror · Atmospheric · Horror

SILENT HILL: Townfall
Shared: Adventure · Psychological Horror · Horror

Resident Evil 7 Biohazard
Shared: Survival Horror · Atmospheric · Horror

Resident Evil 4 (2005)
Shared: Survival Horror · Action · Inventory Management

Escape the Backrooms
Shared: Psychological Horror · Horror · Survival Horror

Outlast 2
Shared: Psychological Horror · Survival Horror · Horror

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Psychological · Adventure

Amnesia: The Dark Descent
Shared: Psychological Horror · Atmospheric · Survival Horror

Five Nights at Freddy's: Security Breach
Shared: Survival Horror · Horror · Singleplayer

The Beast Inside
Shared: Adventure · Survival Horror · Horror

Backrooms: Escape Together
Shared: Psychological Horror · Atmospheric · Survival Horror

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

METRO 2033 Redux
Shared: Atmospheric · Action · Horror

Resident Evil Village
Shared: Survival Horror · Horror · Action

Lethal Company
Shared: Survival Horror · Horror · Psychological Horror

Alien: Isolation
Shared: Survival Horror · Atmospheric · Horror

Bendy and the Dark Revival
Shared: Horror · Survival Horror · Adventure