Games like Morbus
Games like Morbus include Phasmophobia, Escape the Backrooms, Left 4 Dead 2, Backrooms: Escape Together, and Dead by Daylight. We matched them by the tags players give Morbus on Steam (Action, Indie, Early Access, Horror, and Online Co-Op): closest matches first, and among equally close ones the better-known games.

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

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

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

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

Dead by Daylight
Shared: Horror · Multiplayer · Co-op

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

BIGFOOT
Shared: Horror · Multiplayer · Co-op

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

PEAK
Shared: Co-op · Online Co-Op · Multiplayer

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

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

How to Fish
Shared: Indie · Co-op · Online Co-Op

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

Resident Evil 5
Shared: Action · Co-op · Horror

Resident Evil 6
Shared: Action · Co-op · Horror

Ghost Exile
Shared: Horror · Action · Co-op

PAYDAY 2
Shared: Action · Co-op · Multiplayer

DEVOUR
Shared: Horror · Online Co-Op · Multiplayer

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

Left 4 Dead
Shared: Action · Co-op · Horror

HELLDIVERS™ 2
Shared: Action · Online Co-Op · Multiplayer

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

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

No More Room in Hell 2
Shared: Action · Co-op · Online Co-Op