Games like QuietMansion1
Games like QuietMansion1 include Resident Evil Requiem, Resident Evil 7 Biohazard, Darkwood, Resident Evil Village, and Outlast. We matched them by the tags players give QuietMansion1 on Steam (Survival Horror, Horror, Psychological Horror, FPS, and Realistic): closest matches first, and among equally close ones the better-known games.

Resident Evil Requiem
Shared: Survival Horror · Horror · Zombies

Resident Evil 7 Biohazard
Shared: Survival Horror · Horror · Psychological Horror

Darkwood
Shared: Survival Horror · Horror · Psychological Horror

Resident Evil Village
Shared: Survival Horror · Horror · Zombies

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Dying Light
Shared: Survival Horror · Horror · Zombies

Resident Evil 4
Shared: Horror · Survival Horror · Zombies

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

The Forest
Shared: Horror · Survival · Survival Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

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

Resident Evil 2
Shared: Survival Horror · Horror · Zombies

Left 4 Dead 2
Shared: FPS · Zombies · Horror

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Ready or Not
Shared: FPS · Realistic · Horror

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

SILENT HILL 2
Shared: Horror · Psychological Horror · Survival Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Singleplayer

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

Subnautica 2
Shared: Horror · Survival · Survival Horror

Metro Exodus
Shared: FPS · Horror · Singleplayer

Amnesia: The Bunker
Shared: Survival Horror · Horror · Atmospheric

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

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