Games like Duck Season PC
Games like Duck Season PC include No, I'm not a Human, Outlast, Mouthwashing, Ready or Not, and Poppy Playtime. We matched them by the tags players give Duck Season PC on Steam (Horror, Indie, Casual, Psychological Horror, and Atmospheric): closest matches first, and among equally close ones the better-known games.

No, I'm not a Human
Shared: Horror · Indie · Psychological Horror

Outlast
Shared: Horror · First-Person · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Indie

Ready or Not
Shared: Horror · Shooter · FPS

Poppy Playtime
Shared: Horror · Singleplayer · First-Person

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Singleplayer

Half-Life: Alyx
Shared: Horror · FPS · Singleplayer

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

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

Buckshot Roulette
Shared: Horror · Indie · First-Person

SOMA
Shared: Horror · Psychological Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · First-Person

Trepang2
Shared: Horror · Singleplayer · Shooter

Resident Evil Village
Shared: Horror · First-Person · Singleplayer

METRO 2033 Redux
Shared: Horror · Atmospheric · FPS

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

Lost in Vivo
Shared: Horror · Psychological Horror · Indie

Lethal Company
Shared: Horror · First-Person · Psychological Horror

Blood and Bacon
Shared: Horror · Shooter · FPS

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Duck Season
Shared: Horror · Psychological Horror · Indie

Five Nights at Freddy's 2
Shared: Horror · Psychological Horror · Singleplayer

FIVE NIGHTS AT FREDDY'S: HELP WANTED
Shared: Horror · Singleplayer · First-Person

F.E.A.R.
Shared: Horror · FPS · Singleplayer