Games like Level P
Games like Level P include Firewatch, Dishonored, What Remains of Edith Finch, Outlast, and Dishonored 2. We matched them by the tags players give Level P on Steam (First-Person, Runner, Psychological, Atmospheric, and Mystery): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Atmospheric · First-Person · Mystery

Dishonored
Shared: First-Person · Stealth · Action

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Mystery

Outlast
Shared: First-Person · Atmospheric · Singleplayer

Dishonored 2
Shared: First-Person · Stealth · Action

The Stanley Parable
Shared: First-Person · Psychological · Walking Simulator

The Beginner's Guide
Shared: First-Person · Atmospheric · Walking Simulator

Thief
Shared: First-Person · Action · Stealth

Five Nights at Freddy's: Security Breach
Shared: First-Person · Singleplayer · Stealth

Hellblade: Senua's Sacrifice
Shared: Psychological · Atmospheric · Singleplayer

METRO Last Light Redux
Shared: Atmospheric · First-Person · Action

METRO 2033 Redux
Shared: Atmospheric · First-Person · Action

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

Poppy Playtime
Shared: First-Person · Singleplayer · Mystery

Metro Exodus
Shared: Atmospheric · First-Person · Action

The Long Dark
Shared: First-Person · Atmospheric · Singleplayer

Amnesia: The Bunker
Shared: Atmospheric · First-Person · Stealth

BioShock Infinite
Shared: First-Person · Action · Atmospheric

Far Cry® Primal
Shared: First-Person · Action · Adventure

Thief Simulator 2
Shared: First-Person · Stealth · Action

We Happy Few
Shared: First-Person · Action · Adventure

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

Grand Theft Auto V Legacy
Shared: Action · First-Person · Adventure

Far Cry® 4
Shared: Action · First-Person · Adventure