Games like Slumber Party
Games like Slumber Party include Dead by Daylight, DEVOUR, Phasmophobia, Inside the Backrooms, and Escape the Backrooms. We matched them by the tags players give Slumber Party on Steam (Multiplayer, Online Co-Op, Survival Horror, Horror, and Puzzle): closest matches first, and among equally close ones the better-known games.

Dead by Daylight
Shared: Multiplayer · Horror · Survival Horror

DEVOUR
Shared: Online Co-Op · Multiplayer · Horror

Phasmophobia
Shared: Online Co-Op · Multiplayer · Horror

Inside the Backrooms
Shared: Multiplayer · Horror · Survival Horror

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

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

Outlast
Shared: Horror · Survival Horror · Multiplayer

Pacify
Shared: Online Co-Op · Multiplayer · Horror

Lethal Company
Shared: Online Co-Op · Horror · Survival Horror

Poppy Playtime
Shared: Horror · Puzzle · Survival Horror

The Outlast Trials
Shared: Multiplayer · Horror · Survival Horror

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Dying Light
Shared: Survival Horror · Online Co-Op · Horror

In Silence
Shared: Multiplayer · Online Co-Op · Horror

Resident Evil 7 Biohazard
Shared: Survival Horror · Horror · First-Person

Demonologist
Shared: Multiplayer · Online Co-Op · Horror

Nuclear Nightmare
Shared: Online Co-Op · Survival Horror · Horror

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

PANICORE
Shared: Online Co-Op · Horror · Survival Horror

Granny
Shared: Multiplayer · Survival Horror · Horror

BIGFOOT
Shared: Multiplayer · Survival Horror · Online Co-Op

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

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

Lunch Lady
Shared: Online Co-Op · Multiplayer · Horror