Games like Perpetual Fear
Games like Perpetual Fear include Five Nights at Freddy's: Security Breach, SchoolBoy Runaway, MiSide, Buckshot Roulette, and Escape the Backrooms. We matched them by the tags players give Perpetual Fear on Steam (Simulation, 3D, Adventure, First-Person, and Horror): closest matches first, and among equally close ones the better-known games.

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

SchoolBoy Runaway
Shared: Simulation · Adventure · Horror

MiSide
Shared: Horror · First-Person · 3D

Buckshot Roulette
Shared: First-Person · Horror · 3D

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

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

The Forest
Shared: Horror · Adventure · First-Person

Thief Simulator
Shared: Simulation · First-Person · Singleplayer

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Slime Rancher 2
Shared: First-Person · Singleplayer · Simulation

Slime Rancher
Shared: Adventure · First-Person · Singleplayer

That's not my Neighbor
Shared: Adventure · Simulation · Horror

Contraband Police
Shared: Simulation · First-Person · Singleplayer

Dollmare
Shared: Simulation · 3D · Horror

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

Totally Accurate Battle Simulator
Shared: Simulation · Adventure · Singleplayer

Outlast
Shared: First-Person · Horror · Singleplayer

VERGE:Lost chapter
Shared: Simulation · Adventure · Horror

Grunn
Shared: Simulation · Horror · Multiple Endings

No, I'm not a Human
Shared: Horror · Singleplayer · Indie

Garten of Banban
Shared: Horror · First-Person · Singleplayer

Killer Frequency
Shared: Adventure · Horror · Simulation

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

Papers, Please
Shared: Simulation · Indie · Singleplayer