Games like Someone is behind you
Games like Someone is behind you include Poppy Playtime, MiSide, Outlast, Garten of Banban, and Layers of Fear (2016). We matched them by the tags players give Someone is behind you on Steam (3D, Psychological Horror, Linear, Singleplayer, and Runner): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Singleplayer · Horror · Psychological Horror

MiSide
Shared: Psychological Horror · 3D · Singleplayer

Outlast
Shared: Psychological Horror · Horror · Singleplayer

Garten of Banban
Shared: Psychological Horror · Singleplayer · Horror

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Singleplayer

From The Darkness
Shared: Psychological Horror · Horror · Dark

Buckshot Roulette
Shared: Dark · Singleplayer · Horror

Little Nightmares II
Shared: Singleplayer · Adventure · Horror

Mouthwashing
Shared: Psychological Horror · Horror · Walking Simulator

Little Nightmares
Shared: Singleplayer · Horror · Adventure

Garten of Banban 2
Shared: Singleplayer · Psychological Horror · Horror

SOMA
Shared: Psychological Horror · Horror · Dark

What Remains of Edith Finch
Shared: Singleplayer · Walking Simulator · Adventure

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

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

Visage
Shared: Psychological Horror · Horror · Singleplayer

Firewatch
Shared: Adventure · Singleplayer · Walking Simulator

9 Childs Street
Shared: Psychological Horror · Horror · 3D

Outlast 2
Shared: Psychological Horror · Horror · Singleplayer

Blair Witch
Shared: Psychological Horror · Adventure · Horror

Escape the Backrooms
Shared: Psychological Horror · Horror · 3D

Phasmophobia
Shared: Psychological Horror · Horror · Dark

ROUTINE
Shared: Psychological Horror · Singleplayer · Adventure

Still Wakes the Deep
Shared: Psychological Horror · Horror · Walking Simulator