Games like Last Known Vector
Games like Last Known Vector include Poppy Playtime, Outlast, Dead Space (2008), Buckshot Roulette, and Garten of Banban. We matched them by the tags players give Last Known Vector on Steam (Horror, Sci-fi, Action, Mystery, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Outlast
Shared: Horror · First-Person · Singleplayer

Dead Space (2008)
Shared: Horror · Sci-fi · Action

Buckshot Roulette
Shared: Horror · Dark · First-Person

Garten of Banban
Shared: Horror · First-Person · Singleplayer

Phasmophobia
Shared: Horror · First-Person · Dark

SOMA
Shared: Horror · Sci-fi · Dark

Alien: Isolation
Shared: Horror · Sci-fi · First-Person

Bendy and the Ink Machine
Shared: Horror · First-Person · Singleplayer

Prey
Shared: Sci-fi · Horror · First-Person

Outer Wilds
Shared: Mystery · Space · Sci-fi

Black Mesa
Shared: Action · Sci-fi · First-Person

The Mortuary Assistant
Shared: Horror · Mystery · First-Person

DOOM 3
Shared: Horror · Action · Sci-fi

Half-Life 2
Shared: Sci-fi · Action · First-Person

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

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

Alan Wake
Shared: Horror · Action · Thriller

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

ROUTINE
Shared: Sci-fi · Horror · Singleplayer

Garten of Banban 2
Shared: Horror · First-Person · Singleplayer

Resident Evil Village
Shared: Horror · Action · First-Person

BioShock™ Remastered
Shared: Horror · Action · First-Person

Dead Space
Shared: Horror · Sci-fi · Singleplayer