Games like S.I.N. Unit - Skins DLC
Games like S.I.N. Unit - Skins DLC include Escape the Backrooms, Backrooms: Escape Together, Lethal Company, Pacify, and Phasmophobia. We matched them by the tags players give S.I.N. Unit - Skins DLC on Steam (Indie, Casual, Horror, Psychological Horror, and Exploration): closest matches first, and among equally close ones the better-known games.

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

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

Lethal Company
Shared: Horror · Online Co-Op · First-Person

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

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

Outlast
Shared: Horror · First-Person · Psychological Horror

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

The Outlast Trials
Shared: Horror · Psychological Horror · Multiplayer

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

Visage
Shared: Horror · Psychological Horror · First-Person

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

Outlast 2
Shared: Horror · Psychological Horror · First-Person

Fears to Fathom® - Scratch Creek
Shared: Horror · Psychological Horror · Casual

PEAK
Shared: Online Co-Op · Multiplayer · Exploration

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

Slender: The Arrival
Shared: Horror · Indie · First-Person

SOMA
Shared: Horror · Psychological Horror · Exploration

Poppy Playtime
Shared: Horror · First-Person · Psychological Horror

Five Nights at Freddy's
Shared: Horror · Indie · Psychological Horror

Buckshot Roulette
Shared: Horror · Indie · Multiplayer

Subnautica 2
Shared: Horror · Multiplayer · Exploration

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

RV There Yet?
Shared: Multiplayer · Online Co-Op · Indie