Games like Devil of the Plague
Games like Devil of the Plague include Phasmophobia, Pacify, Backrooms: Escape Together, Dead by Daylight, and Escape the Backrooms. We matched them by the tags players give Devil of the Plague on Steam (Horror, Atmospheric, Thriller, Psychological Horror, and Survival Horror): closest matches first, and among equally close ones the better-known games.

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

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

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Atmospheric

Dead by Daylight
Shared: Horror · Survival Horror · Multiplayer

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

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

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

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

BIGFOOT
Shared: Horror · Survival Horror · Multiplayer

The Outlast Trials
Shared: Horror · Psychological Horror · Survival Horror

Outlast
Shared: Horror · Atmospheric · Survival Horror

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

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

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

PANICORE
Shared: Horror · Psychological Horror · Survival Horror

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

Labyrinthine
Shared: Horror · Psychological Horror · Co-op

Little Nightmares II
Shared: Horror · Atmospheric · Psychological Horror

In Silence
Shared: Horror · Survival Horror · Psychological Horror

Subnautica 2
Shared: Horror · Multiplayer · Co-op

Little Nightmares III
Shared: Horror · Co-op · Atmospheric

Left 4 Dead 2
Shared: Co-op · Horror · Multiplayer

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

Zort
Shared: Horror · Psychological Horror · Co-op