Games like Duder
Games like Duder include Outlast, The Forest, Poppy Playtime, Darkwood, and Sons Of The Forest. We matched them by the tags players give Duder on Steam (Indie, Adventure, Survival, Horror, and Survival Horror): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Atmospheric

The Forest
Shared: Survival · Horror · Adventure

Poppy Playtime
Shared: Horror · Survival Horror · Indie

Darkwood
Shared: Adventure · Horror · Survival Horror

Sons Of The Forest
Shared: Survival · Survival Horror · Horror

Five Nights at Freddy's
Shared: Horror · Indie · Survival Horror

Little Nightmares
Shared: Adventure · Horror · Atmospheric

The Beast Inside
Shared: Adventure · Horror · Survival Horror

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Subnautica 2
Shared: Survival · Horror · Adventure

Slender: The Arrival
Shared: Indie · Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

DreadOut
Shared: Indie · Adventure · Horror

Penumbra Overture
Shared: Adventure · Horror · Indie

Inside the Backrooms
Shared: Horror · Survival Horror · Adventure

The Outlast Trials
Shared: Horror · Survival Horror · Psychological Horror

We Happy Few
Shared: Adventure · Survival · Indie

Blair Witch
Shared: Adventure · Indie · Horror

Don't Starve Together
Shared: Survival · Adventure · Indie

DEVOUR
Shared: Horror · Survival Horror · Survival

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

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

Dead by Daylight
Shared: Horror · Survival Horror · Survival

Five Nights at Freddy's 2
Shared: Horror · Survival Horror · Indie