Games like The Decree
Games like The Decree include Lethal Company, Escape the Backrooms, Dead by Daylight, Content Warning, and Phasmophobia. We matched them by the tags players give The Decree on Steam (Online Co-Op, Horror, Action Roguelike, Psychological Horror, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

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

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

Content Warning
Shared: Online Co-Op · Horror · Action Roguelike

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

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

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

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

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

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

PEAK
Shared: Online Co-Op · Co-op · 3D

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

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

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

KLETKA
Shared: Horror · Online Co-Op · Co-op

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

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

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

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

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Online Co-Op

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

Gunfire Reborn
Shared: Online Co-Op · Roguelite · Action Roguelike

Resident Evil 5
Shared: Online Co-Op · Horror · Co-op

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