Games like I'm on Observation Duty 2
Games like I'm on Observation Duty 2 include Amnesia: The Dark Descent, Scorn, Outlast 2, Outlast, and Buckshot Roulette. We matched them by the tags players give I'm on Observation Duty 2 on Steam (Indie, Strategy, Nudity, Gore, and Horror): closest matches first, and among equally close ones the better-known games.

Amnesia: The Dark Descent
Shared: Gore · Horror · Psychological Horror

Scorn
Shared: Gore · Horror · Nudity

Outlast 2
Shared: Horror · Psychological Horror · Gore

Outlast
Shared: Horror · Gore · Psychological Horror

Buckshot Roulette
Shared: Strategy · Horror · Indie

Firework
Shared: Indie · Horror · Puzzle

Lucius
Shared: Horror · Gore · Nudity

Welcome to the Game II
Shared: Strategy · Indie · Horror

ParanormalHK
Shared: Horror · Nudity · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · Singleplayer

Poppy Playtime
Shared: Horror · Singleplayer · Puzzle

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

Lobotomy Corporation | Monster Management Simulation
Shared: Psychological Horror · Horror · Gore

Fran Bow
Shared: Psychological Horror · Indie · Horror

Mouthwashing
Shared: Horror · Indie · Psychological Horror

I'm on Observation Duty
Shared: Indie · Horror · Psychological Horror

Little Nightmares
Shared: Horror · Indie · Singleplayer

Welcome to the Game
Shared: Indie · Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Clive Barker's Hellraiser: Revival
Shared: Gore · Nudity · Horror

Little Nightmares II
Shared: Horror · Singleplayer · Puzzle

Resident Evil 7 Biohazard
Shared: Horror · Gore · Singleplayer

Sally Face - Episode One
Shared: Indie · Psychological Horror · Horror

Detention
Shared: Indie · Horror · Psychological Horror