Games like Eresys
Games like Eresys include Left 4 Dead 2, Dead by Daylight, R.E.P.O., Escape the Backrooms, and PUBG: BATTLEGROUNDS. We matched them by the tags players give Eresys on Steam (Action, Horror, Online Co-Op, Lovecraftian, and Multiplayer): closest matches first, and among equally close ones the better-known games.

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

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

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

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

PUBG: BATTLEGROUNDS
Shared: Survival · Multiplayer · Action

Phasmophobia
Shared: Horror · Online Co-Op · Multiplayer

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

Left 4 Dead
Shared: Action · Multiplayer · Horror

Back 4 Blood
Shared: Online Co-Op · Multiplayer · Action

Far Cry 3
Shared: Action · Multiplayer · Adventure

Far Cry® 4
Shared: Action · Multiplayer · Adventure

PAYDAY 2
Shared: Action · Co-op · Multiplayer

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

PEAK
Shared: Online Co-Op · Multiplayer · Adventure

Grounded
Shared: Multiplayer · Survival · Co-op

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

Killing Floor
Shared: Horror · Action · Multiplayer

DEVOUR
Shared: Horror · Online Co-Op · Multiplayer

GTFO
Shared: Horror · Online Co-Op · Action

The Outlast Trials
Shared: Horror · Multiplayer · Co-op

Little Nightmares III
Shared: Horror · Adventure · Multiplayer

Resident Evil 6
Shared: Action · Horror · Online Co-Op

DayZ
Shared: Online Co-Op · Survival · Multiplayer

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