Games like The Overseer
Games like The Overseer include Phasmophobia, The Mortuary Assistant, Firework, The Room Two, and The Room. We matched them by the tags players give The Overseer on Steam (Hidden Object, Horror, Singleplayer, Investigation, and Supernatural): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Supernatural · Investigation

The Mortuary Assistant
Shared: Horror · Supernatural · Singleplayer

Firework
Shared: Horror · Mystery · Singleplayer

The Room Two
Shared: Hidden Object · Horror · Mystery

The Room
Shared: Singleplayer · Mystery · Hidden Object

Five Nights at Freddy's
Shared: Horror · Singleplayer · Indie

Ghost Exorcism INC.
Shared: Horror · Investigation · Supernatural

Poppy Playtime
Shared: Horror · Singleplayer · Mystery

[Chillas Art] Shinkansen 0 0
Shared: Horror · Supernatural · Investigation

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

Dollmare
Shared: Horror · Simulation · Supernatural

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

The Room Three
Shared: Mystery · Hidden Object · Singleplayer

Subliminal
Shared: Singleplayer · Horror · Mystery

MiSide
Shared: Horror · Singleplayer · Psychological Horror

The Test
Shared: Simulation · Singleplayer · Horror

The Painscreek Killings
Shared: Investigation · Mystery · Horror

Getting Over It with Bennett Foddy
Shared: Singleplayer · Horror · Psychological Horror

Banana
Shared: Singleplayer · Casual · Hidden Object

The Room 4: Old Sins
Shared: Mystery · Hidden Object · Singleplayer

I'm on Observation Duty 7
Shared: Horror · Hidden Object · Mystery

The Test: Hypothesis Rising
Shared: Horror · Simulation · Investigation

Garten of Banban
Shared: Horror · Singleplayer · Psychological Horror

The Death | Thần Trùng
Shared: Horror · Casual · Indie