Games like Monolith O Pesadelo
Games like Monolith O Pesadelo include Poppy Playtime, Outlast, SOMA, Lethal Company, and Darkwood. We matched them by the tags players give Monolith O Pesadelo on Steam (Horror, Dark, Exploration, Supernatural, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Dark · Survival Horror

Outlast
Shared: Horror · Atmospheric · Survival Horror

SOMA
Shared: Horror · Atmospheric · Dark

Lethal Company
Shared: Horror · Exploration · First-Person

Darkwood
Shared: Horror · Dark · Survival Horror

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

Pacify
Shared: Horror · Exploration · Survival Horror

Amnesia: The Dark Descent
Shared: Horror · Atmospheric · Survival Horror

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

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

Amnesia: Rebirth
Shared: Horror · First-Person · Exploration

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

Resident Evil Requiem
Shared: Horror · Survival Horror · Action

Resident Evil Village
Shared: Horror · Survival Horror · Action

Inside the Backrooms
Shared: Horror · Survival Horror · Exploration

The Forest
Shared: Horror · Survival Horror · Exploration

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

Little Nightmares
Shared: Horror · Atmospheric · Dark

Little Nightmares II
Shared: Horror · Dark · Atmospheric

Outlast 2
Shared: Horror · Dark · Survival Horror

Escape the Backrooms
Shared: Horror · Exploration · Survival Horror

Resident Evil 2
Shared: Horror · Survival Horror · Action

Buckshot Roulette
Shared: Dark · Horror · First-Person

Resident Evil 4
Shared: Horror · Action · Survival Horror