Games like Beso's Shawarma
Games like Beso's Shawarma include Mouthwashing, No, I'm not a Human, Layers of Fear (2016), Amnesia: A Machine For Pigs, and SOMA. We matched them by the tags players give Beso's Shawarma on Steam (Psychological Horror, Horror, Walking Simulator, Atmospheric, and Choose Your Own Adventure): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

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

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Walking Simulator

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Dagon: by H. P. Lovecraft
Shared: Horror · Atmospheric · Psychological Horror

The Casting of Frank Stone™
Shared: Horror · Multiple Endings · Psychological Horror

Tiny Bunny
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Story Rich

MiSide
Shared: Psychological Horror · Horror · Story Rich

Slay the Princess — The Pristine Cut
Shared: Psychological Horror · Horror · Choose Your Own Adventure

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

Sally Face - Episode One
Shared: Psychological Horror · Horror · Story Rich

The Test
Shared: Choose Your Own Adventure · Psychological Horror · Multiple Endings

While We Wait Here
Shared: Horror · Psychological Horror · Choose Your Own Adventure

Firewatch
Shared: Atmospheric · Walking Simulator · Story Rich

Outlast
Shared: Horror · Psychological Horror · Atmospheric

THRESHOLD
Shared: Psychological Horror · Horror · Atmospheric

Fears to Fathom - Norwood Hitchhike
Shared: Psychological Horror · Horror · Atmospheric

OMORI
Shared: Psychological Horror · Story Rich · Horror

Little Nightmares
Shared: Horror · Atmospheric · Psychological Horror

The Cabin Factory
Shared: Psychological Horror · Horror · Walking Simulator

SILENT HILL 2
Shared: Psychological Horror · Horror · Atmospheric

Little Nightmares II
Shared: Horror · Psychological Horror · Atmospheric