Games like Prime Horror II
Games like Prime Horror II include R.E.P.O., Liars Bar, Garry's Mod, Phasmophobia, and PEAK. We matched them by the tags players give Prime Horror II on Steam (Casual, Multiplayer, First-Person, Horror, and Comedy): closest matches first, and among equally close ones the better-known games.

R.E.P.O.
Shared: Multiplayer · Horror · Online Co-Op

Liars Bar
Shared: Casual · Multiplayer · Online Co-Op

Garry's Mod
Shared: Multiplayer · Casual · First-Person

Phasmophobia
Shared: Multiplayer · Horror · Online Co-Op

PEAK
Shared: Multiplayer · Online Co-Op · First-Person

Escape the Backrooms
Shared: Multiplayer · Horror · Online Co-Op

Dead by Daylight
Shared: Multiplayer · Horror · Online Co-Op

Backrooms: Escape Together
Shared: Multiplayer · Horror · Online Co-Op

Content Warning
Shared: Horror · Online Co-Op · Multiplayer

How to Fish
Shared: Multiplayer · Online Co-Op · First-Person

Who's Your Daddy?!
Shared: Multiplayer · First-Person · Comedy

Left 4 Dead 2
Shared: Multiplayer · Online Co-Op · Horror

Dale & Dawson Stationery Supplies
Shared: Casual · Multiplayer · First-Person

Pacify
Shared: Multiplayer · Horror · Online Co-Op

Shift At Midnight
Shared: Multiplayer · Horror · Online Co-Op

WEBFISHING
Shared: Multiplayer · Casual · Online Co-Op

MECCHA CHAMELEON
Shared: Casual · Multiplayer · Online Co-Op

Inside the Backrooms
Shared: Multiplayer · Horror · Online Co-Op

Ready or Not
Shared: Multiplayer · Horror · First-Person

PowerWash Simulator
Shared: Casual · Multiplayer · First-Person

Demonologist
Shared: Multiplayer · Horror · First-Person

Fears to Fathom® - Scratch Creek
Shared: Multiplayer · Horror · Casual

PUBG: BATTLEGROUNDS
Shared: Multiplayer · Online Co-Op · FPS

Blood and Bacon
Shared: Multiplayer · Horror · First-Person