Games like Nocturnal Relics
Games like Nocturnal Relics include Five Nights at Freddy's: Security Breach, Poppy Playtime, Amnesia: Rebirth, Escape the Backrooms, and Little Nightmares. We matched them by the tags players give Nocturnal Relics on Steam (Horror, Education, First-Person, Adventure, and Puzzle): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Singleplayer

Poppy Playtime
Shared: Horror · First-Person · Puzzle

Amnesia: Rebirth
Shared: First-Person · Horror · Puzzle

Escape the Backrooms
Shared: Horror · First-Person · Adventure

Little Nightmares
Shared: Horror · Adventure · Singleplayer

Little Nightmares II
Shared: Horror · Adventure · Puzzle

SchoolBoy Runaway
Shared: Horror · Adventure · Puzzle

Bendy and the Dark Revival
Shared: Horror · First-Person · Singleplayer

Portal 2
Shared: First-Person · Puzzle · Singleplayer

The Room 4: Old Sins
Shared: Puzzle · Adventure · Horror

Outer Wilds
Shared: Adventure · Exploration · Puzzle

Indiana Jones and the Great Circle
Shared: First-Person · Puzzle · Adventure

Rise of the Tomb Raider™
Shared: Adventure · Female Protagonist · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · First-Person · Adventure

The Room
Shared: Puzzle · Adventure · Singleplayer

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

The Forest
Shared: Horror · Adventure · First-Person

Outlast
Shared: Horror · First-Person · Singleplayer

A Plague Tale: Innocence
Shared: Adventure · Female Protagonist · Stealth

Inside the Backrooms
Shared: Horror · Puzzle · Adventure

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

Hello Neighbor 2
Shared: Horror · Adventure · First-Person

Tomb Raider Game of the Year
Shared: Adventure · Female Protagonist · Singleplayer

Alien: Isolation
Shared: Horror · First-Person · Stealth