Games like Descent Into Darkness
Games like Descent Into Darkness include Lethal Company, Dead by Daylight, R.E.P.O., Left 4 Dead 2, and PEAK. We matched them by the tags players give Descent Into Darkness on Steam (Horror, Survival, Female Protagonist, Procedural Generation, and Online Co-Op): closest matches first, and among equally close ones the better-known games.

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

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

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

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

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

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

Content Warning
Shared: Horror · Online Co-Op · Procedural Generation

Subnautica 2
Shared: Survival · Horror · Co-op

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

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

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

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

The Forest
Shared: Survival · Horror · Adventure

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

Grounded
Shared: Survival · Co-op · Horror

7 Days to Die
Shared: Survival · Online Co-Op · Zombies

Resident Evil Revelations 2
Shared: Horror · Co-op · Survival

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

Don't Starve Together
Shared: Survival · Co-op · Online Co-Op

PUBG: BATTLEGROUNDS
Shared: Survival · Online Co-Op · Co-op

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

Killing Floor
Shared: Survival · Horror · Co-op

Valheim
Shared: Survival · Online Co-Op · Co-op

DayZ
Shared: Survival · Online Co-Op · Horror