Games like DeathWatchers
Games like DeathWatchers include Phasmophobia, Pacify, Backrooms: Escape Together, Demonologist, and Escape the Backrooms. We matched them by the tags players give DeathWatchers on Steam (Online Co-Op, Horror, Psychological Horror, Hidden Object, and Supernatural): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Online Co-Op · Horror · Psychological Horror

Pacify
Shared: Online Co-Op · Horror · Psychological Horror

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

Demonologist
Shared: Horror · Online Co-Op · Psychological Horror

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

DEVOUR
Shared: Online Co-Op · Horror · Multiplayer

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

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

Labyrinthine
Shared: Online Co-Op · Horror · Psychological Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

Ghost Exorcism INC.
Shared: Horror · Psychological Horror · Multiplayer

The Outlast Trials
Shared: Horror · Psychological Horror · Multiplayer

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

Zort
Shared: Online Co-Op · Horror · Psychological Horror

BIGFOOT
Shared: Horror · Online Co-Op · Multiplayer

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

Buckshot Roulette
Shared: Horror · Multiplayer · Dark

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

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

Ready or Not
Shared: Horror · Multiplayer · Psychological Horror

PEAK
Shared: Online Co-Op · Multiplayer · Co-op

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

Ghost Exile
Shared: Online Co-Op · Horror · Psychological Horror

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