Games like BeyondThere
Games like BeyondThere include Five Nights at Freddy's, Poppy Playtime, Buckshot Roulette, Outlast, and No, I'm not a Human. We matched them by the tags players give BeyondThere on Steam (Simulation, First-Person, Dark, Horror, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

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

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Buckshot Roulette
Shared: Dark · First-Person · Horror

Outlast
Shared: First-Person · Horror · Psychological Horror

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

Outlast 2
Shared: Horror · First-Person · Psychological Horror

Five Nights at Freddy's 2
Shared: Horror · Singleplayer · First-Person

Five Nights at Freddy's 4
Shared: Horror · First-Person · Dark

Visage
Shared: Horror · Dark · Psychological Horror

MiSide
Shared: Psychological Horror · First-Person · Horror

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Five Nights at Freddy's 3
Shared: Horror · First-Person · Singleplayer

Five Nights at Freddy's: Sister Location
Shared: Horror · First-Person · Dark

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

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

Ultimate Custom Night
Shared: Horror · Singleplayer · First-Person

SOMA
Shared: Horror · Psychological Horror · Dark

Slender: The Arrival
Shared: First-Person · Horror · Dark

Layers of Fear (2016)
Shared: Horror · First-Person · Psychological Horror

Welcome to the Game II
Shared: Horror · Simulation · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Indie

MADiSON
Shared: Horror · Dark · First-Person

Dark Deception
Shared: Horror · First-Person · Singleplayer

Blair Witch
Shared: Horror · First-Person · Psychological Horror