Games like Nyctophilia
Games like Nyctophilia include OMORI, Poppy Playtime, DISTRAINT: Deluxe Edition, Samsara Room, and Firework. We matched them by the tags players give Nyctophilia on Steam (Free to Play, Indie, Adventure, Horror, and 2D): closest matches first, and among equally close ones the better-known games.

OMORI
Shared: Indie · Pixel Graphics · Psychological Horror

Poppy Playtime
Shared: Free to Play · Horror · Indie

DISTRAINT: Deluxe Edition
Shared: Indie · Horror · Adventure

Samsara Room
Shared: Indie · Free to Play · Adventure

Firework
Shared: Indie · Horror · 2D

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

Tales of the Black Forest
Shared: Indie · Horror · Pixel Graphics

Dark Deception
Shared: Free to Play · Horror · Indie

Cat in the Box
Shared: Adventure · Horror · Indie

Five Nights at Freddy's: Into the Pit
Shared: Horror · Adventure · Pixel Graphics

Mad Father
Shared: Horror · 2D · Pixel Graphics

Ib
Shared: Indie · Horror · Pixel Graphics

Sally Face - Episode One
Shared: Indie · Horror · Adventure

Jump King
Shared: Indie · Adventure · Pixel Graphics

Terraria
Shared: 2D · Adventure · Pixel Graphics

KinitoPET
Shared: Indie · Horror · 2D

CARRION
Shared: Pixel Graphics · Indie · Horror

FAITH: The Unholy Trinity
Shared: Horror · Indie · Pixel Graphics

Detention
Shared: Indie · Horror · Adventure

Bad Dream: Fever
Shared: Indie · Adventure · Horror

INMOST
Shared: Indie · Adventure · Pixel Graphics

We Were Here
Shared: Free to Play · Horror · Adventure

Martial Law
Shared: Free to Play · Pixel Graphics · Adventure

IMSCARED
Shared: Indie · Horror · Adventure