Games like Thirty Minute Nightmare
Games like Thirty Minute Nightmare include Outlast, Resident Evil 7 Biohazard, The Forest, Resident Evil Village, and Resident Evil Requiem. We matched them by the tags players give Thirty Minute Nightmare on Steam (Adventure, Survival Horror, Atmospheric, Retro, and FPS): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Survival Horror · Atmospheric · First-Person

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

The Forest
Shared: Adventure · Survival Horror · Horror

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

Resident Evil Requiem
Shared: Survival Horror · FPS · Horror

METRO 2033 Redux
Shared: Atmospheric · FPS · Horror

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

Metro Exodus
Shared: FPS · Atmospheric · Adventure

Sons Of The Forest
Shared: Survival Horror · Horror · Adventure

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

METRO Last Light Redux
Shared: Atmospheric · FPS · Horror

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

The Beast Inside
Shared: Adventure · Survival Horror · Horror

Nightmare of Decay
Shared: Survival Horror · FPS · Horror

Bendy and the Dark Revival
Shared: Survival Horror · Adventure · Horror

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

Alien: Isolation
Shared: Survival Horror · Atmospheric · Horror

Dying Light
Shared: Survival Horror · Horror · First-Person

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

Sker Ritual
Shared: Adventure · Atmospheric · Action-Adventure

Inside the Backrooms
Shared: Survival Horror · Adventure · Horror

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

Northern Journey
Shared: Atmospheric · FPS · Retro

Lost in Vivo
Shared: Atmospheric · Survival Horror · Horror