Games like Hunted Within: The Walls
Games like Hunted Within: The Walls include Outlast, The Forest, Resident Evil 7 Biohazard, Firewatch, and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Hunted Within: The Walls on Steam (Horror, Atmospheric, Survival Horror, Adventure, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Atmospheric

The Forest
Shared: Horror · Adventure · Survival Horror

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

Firewatch
Shared: Atmospheric · Adventure · First-Person

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

Resident Evil Village
Shared: Horror · Survival Horror · Singleplayer

Poppy Playtime
Shared: Horror · Singleplayer · Survival Horror

SOMA
Shared: Horror · Atmospheric · Survival Horror

Outlast 2
Shared: Horror · Survival Horror · First-Person

Metro Exodus
Shared: Singleplayer · Atmospheric · Horror

The Beast Inside
Shared: Horror · Adventure · Survival Horror

METRO 2033 Redux
Shared: Atmospheric · Horror · Singleplayer

Lethal Company
Shared: Horror · Survival Horror · First-Person

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Adventure

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

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Bendy and the Ink Machine
Shared: Horror · Singleplayer · First-Person

Sons Of The Forest
Shared: Survival Horror · Horror · First-Person

Little Nightmares
Shared: Horror · Atmospheric · Adventure

Subnautica
Shared: Horror · Exploration · Singleplayer

God of War
Shared: Singleplayer · Adventure · Combat

METRO Last Light Redux
Shared: Atmospheric · Horror · Singleplayer

Alien: Isolation
Shared: Horror · Survival Horror · Atmospheric

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