Games like Observo
Games like Observo include Poppy Playtime, Resident Evil 2, Little Nightmares, Inside the Backrooms, and Alan Wake. We matched them by the tags players give Observo on Steam (Horror, Action, Puzzle, Adventure, and Third Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · Survival Horror

Resident Evil 2
Shared: Horror · Survival Horror · Action

Little Nightmares
Shared: Horror · Adventure · Puzzle

Inside the Backrooms
Shared: Horror · Puzzle · Survival Horror

Alan Wake
Shared: Horror · Action · Adventure

Outlast
Shared: Horror · Survival Horror · Atmospheric

Firework
Shared: Horror · Puzzle · Indie

DreadOut
Shared: Horror · Adventure · Third Person

Tormented Souls
Shared: Horror · Puzzle · Action

Little Nightmares II
Shared: Horror · Adventure · Puzzle

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

The Evil Within 2
Shared: Horror · Action · Survival Horror

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

Resident Evil 4 (2005)
Shared: Action · Horror · Survival Horror

Resident Evil 0
Shared: Horror · Adventure · Action

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

Darkwood
Shared: Horror · Adventure · Action

Garten of Banban
Shared: Horror · Puzzle · Psychological Horror

Bendy and the Ink Machine
Shared: Horror · Puzzle · Survival Horror

Stray
Shared: Adventure · Atmospheric · Puzzle

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

SOMA
Shared: Horror · Atmospheric · Psychological Horror

DARQ: Complete Edition
Shared: Horror · Puzzle · Adventure

Tomb Raider Game of the Year
Shared: Action · Adventure · Third Person