Games like Security Duty
Games like Security Duty include Outlast, Bendy and the Dark Revival, Five Nights at Freddy's: Security Breach, Ghostwire: Tokyo, and Five Nights at Freddy's: Secret of the Mimic. We matched them by the tags players give Security Duty on Steam (Horror, Casual, First-Person, Action, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · First-Person · Atmospheric

Bendy and the Dark Revival
Shared: Horror · First-Person · Action

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Singleplayer

Ghostwire: Tokyo
Shared: Horror · First-Person · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · First-Person · Action

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

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

Resident Evil Requiem
Shared: Horror · Action · First-Person

Black Myth: Wukong
Shared: Action · Combat · Action-Adventure

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Escape the Backrooms
Shared: Horror · First-Person · Action

METRO 2033 Redux
Shared: Horror · Atmospheric · Action

METRO Last Light Redux
Shared: Horror · Action · Atmospheric

The Hat Man: Shadow Ward
Shared: Horror · First-Person · Atmospheric

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

Choo-Choo Charles
Shared: Horror · First-Person · Singleplayer

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

MiSide
Shared: Horror · First-Person · Atmospheric

In Sound Mind
Shared: Horror · Action · Atmospheric

Buckshot Roulette
Shared: Horror · First-Person · Singleplayer

Amnesia: The Bunker
Shared: Horror · Atmospheric · First-Person

Metro Exodus
Shared: Horror · Atmospheric · Action

Bendy and the Ink Machine
Shared: Horror · First-Person · Singleplayer

Outlast 2
Shared: Horror · First-Person · Atmospheric