Games like The Carnival Killer
Games like The Carnival Killer include The Outlast Trials, Dead by Daylight, Outlast 2, Outlast, and Phasmophobia. We matched them by the tags players give The Carnival Killer on Steam (Action, Action-Adventure, Hack and Slash, First-Person, and Dark): closest matches first, and among equally close ones the better-known games.

The Outlast Trials
Shared: Horror · First-Person · Action

Dead by Daylight
Shared: Horror · Survival Horror · First-Person

Outlast 2
Shared: First-Person · Horror · Psychological Horror

Outlast
Shared: First-Person · Horror · Survival Horror

Phasmophobia
Shared: Horror · First-Person · Psychological Horror

Pacify
Shared: Horror · First-Person · Psychological Horror

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

Escape the Backrooms
Shared: Horror · First-Person · Psychological Horror

Buckshot Roulette
Shared: Dark · First-Person · Horror

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

Resident Evil 7 Biohazard
Shared: First-Person · Horror · Action

DEVOUR
Shared: Horror · Dark · First-Person

Lethal Company
Shared: First-Person · Horror · Survival Horror

Dying Light
Shared: Horror · First-Person · Survival Horror

Resident Evil 4
Shared: Action · Horror · Survival Horror

Poppy Playtime
Shared: Horror · First-Person · Dark

Ghost Watchers
Shared: Horror · Demons · Action-Adventure

Left 4 Dead 2
Shared: Action · First-Person · Horror

DOOM
Shared: Action · First-Person · Demons

Demonologist
Shared: Horror · First-Person · Dark

Dead Island 2
Shared: Action-Adventure · First-Person · Horror

The Headliners
Shared: Action · Horror · Action-Adventure

Clive Barker's Hellraiser: Revival
Shared: Action · First-Person · Horror

DOOM Eternal
Shared: Action · Demons · First-Person