Games like Nocturnal
Games like Nocturnal include Poppy Playtime, Outlast, Darkwood, Outlast 2, and Ultimate Custom Night. We matched them by the tags players give Nocturnal on Steam (Horror, Psychological Horror, Survival, Survival Horror, and Dark): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Darkwood
Shared: Horror · Psychological Horror · Survival Horror

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Ultimate Custom Night
Shared: Horror · Survival Horror · Survival

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

DEVOUR
Shared: Horror · Survival Horror · Psychological Horror

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

Firework
Shared: Horror · Psychological Horror · 2D

SOMA
Shared: Horror · Psychological Horror · Dark

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

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

Little Nightmares II
Shared: Horror · Psychological Horror · Dark

The Witch's House MV
Shared: Horror · Psychological Horror · 2D

Mad Father
Shared: Horror · Psychological Horror · 2D

DISTRAINT: Deluxe Edition
Shared: Psychological Horror · Horror · 2D

Five Nights at Freddy's 4
Shared: Horror · Survival Horror · Dark

MADiSON
Shared: Horror · Psychological Horror · Survival Horror

Sally Face - Episode One
Shared: Psychological Horror · Horror · Dark

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

Resident Evil 4
Shared: Horror · Survival Horror · Survival

Five Nights at Freddy's 3
Shared: Horror · Survival Horror · Psychological Horror

Dead by Daylight
Shared: Horror · Survival Horror · Survival

Little Nightmares
Shared: Horror · Dark · Psychological Horror