Games like The Luminist
Games like The Luminist include Poppy Playtime, Ultimate Custom Night, Resident Evil 4, Warframe, and Dark Deception. We matched them by the tags players give The Luminist on Steam (Free to Play, Indie, Action, Horror, and Third-Person Shooter): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Free to Play · Horror · Singleplayer

Ultimate Custom Night
Shared: Free to Play · Horror · Singleplayer

Resident Evil 4
Shared: Action · Horror · Third-Person Shooter

Warframe
Shared: Free to Play · Action · Third-Person Shooter

Dark Deception
Shared: Free to Play · Horror · Indie

Little Nightmares
Shared: Horror · Atmospheric · Indie

Outlast
Shared: Horror · Atmospheric · Singleplayer

LIMBO
Shared: Indie · Atmospheric · Dark

INSIDE
Shared: Horror · Atmospheric · Indie

Dead Space (2008)
Shared: Horror · Action · Atmospheric

Dead Space
Shared: Horror · Third-Person Shooter · Singleplayer

Samsara Room
Shared: Indie · Free to Play · Horror

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Horror · Dark

Resident Evil Requiem
Shared: Horror · Action · Third-Person Shooter

Bendy and the Dark Revival
Shared: Horror · Action · Indie

Aimlabs
Shared: Free to Play · Action · Third-Person Shooter

Little Nightmares II
Shared: Horror · Atmospheric · Dark

Resident Evil 4 (2005)
Shared: Action · Horror · Third-Person Shooter

Buckshot Roulette
Shared: Horror · Dark · Indie

Among the Sleep - Enhanced Edition
Shared: Indie · Horror · Atmospheric

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

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

Marvel Rivals
Shared: Free to Play · Third-Person Shooter · Action

Bendy and the Ink Machine
Shared: Horror · Indie · Singleplayer