Games like S.O.V: Passenger 23
Games like S.O.V: Passenger 23 include Mouthwashing, Lethal Company, Inside the Backrooms, Firework, and Amnesia: A Machine For Pigs. We matched them by the tags players give S.O.V: Passenger 23 on Steam (Horror, Psychological Horror, Retro, Indie, and Exploration): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Retro

Lethal Company
Shared: Horror · Psychological Horror · Exploration

Inside the Backrooms
Shared: Horror · Psychological Horror · Exploration

Firework
Shared: Horror · Indie · Psychological Horror

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · Atmospheric

Escape the Backrooms
Shared: Horror · Psychological Horror · Exploration

SOMA
Shared: Horror · Psychological Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

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

Firewatch
Shared: Atmospheric · Mystery · Exploration

Outer Wilds
Shared: Exploration · Mystery · Atmospheric

Outlast
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Mystery · Exploration

Psalm 5:9-13
Shared: Horror · Psychological Horror · Indie

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

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

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Atmospheric

No one lives under the lighthouse Director's cut
Shared: Horror · Indie · Psychological Horror

DREDGE
Shared: Exploration · Psychological Horror · Mystery

Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Atmospheric

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Subliminal
Shared: Psychological Horror · Horror · Mystery