Games like Unplagued
Games like Unplagued include Lethal Company, Escape the Backrooms, Backrooms: Escape Together, Content Warning, and PEAK. We matched them by the tags players give Unplagued on Steam (Horror, Online Co-Op, Multiplayer, First-Person, and Exploration): closest matches first, and among equally close ones the better-known games.

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

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

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

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

PEAK
Shared: Online Co-Op · Multiplayer · Exploration

Pacify
Shared: Horror · Online Co-Op · Multiplayer

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

Phasmophobia
Shared: Horror · Online Co-Op · Multiplayer

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

Nuclear Nightmare
Shared: Online Co-Op · Horror · First-Person

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

RV There Yet?
Shared: Multiplayer · Online Co-Op · Funny

DEVOUR
Shared: Horror · Online Co-Op · Multiplayer

Subnautica 2
Shared: Horror · Multiplayer · Exploration

Murky Divers
Shared: Horror · Multiplayer · Online Co-Op

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

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

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

Labyrinthine
Shared: Horror · Online Co-Op · Multiplayer

BIGFOOT
Shared: Horror · Multiplayer · Online Co-Op

PANICORE
Shared: Horror · Online Co-Op · Multiplayer

Outlast
Shared: Horror · First-Person · Psychological Horror

Sons Of The Forest
Shared: Multiplayer · Horror · Co-op

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