Games like Boo Men
Games like Boo Men include Phasmophobia, Escape the Backrooms, The Outlast Trials, R.E.P.O., and Dead by Daylight. We matched them by the tags players give Boo Men on Steam (Horror, Online Co-Op, Multiplayer, Action, and Heist): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Online Co-Op · Multiplayer

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

The Outlast Trials
Shared: Horror · Multiplayer · First-Person

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

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

PAYDAY 2
Shared: Action · Multiplayer · Heist

Pacify
Shared: Horror · Online Co-Op · Multiplayer

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

DEVOUR
Shared: Horror · Online Co-Op · Multiplayer

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

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

Buckshot Roulette
Shared: Multiplayer · Horror · Dark

The Headliners
Shared: Horror · Online Co-Op · Multiplayer

Lethal Company
Shared: Horror · Online Co-Op · First-Person

Outlast
Shared: Horror · First-Person · Multiplayer

Demonologist
Shared: Horror · Online Co-Op · Multiplayer

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

GTFO
Shared: Horror · Online Co-Op · Multiplayer

Zort
Shared: Horror · Online Co-Op · First-Person

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

Labyrinthine
Shared: Horror · Online Co-Op · Multiplayer

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

PAYDAY 3
Shared: Heist · Multiplayer · Action

Dying Light
Shared: Horror · Online Co-Op · First-Person