Games like The Last Patient
Games like The Last Patient include DOOM Eternal, DOOM, Left 4 Dead 2, Resident Evil Village, and Trepang2. We matched them by the tags players give The Last Patient on Steam (Action, Gore, Violent, Indie, and Horror): closest matches first, and among equally close ones the better-known games.

DOOM Eternal
Shared: Gore · Action · FPS

DOOM
Shared: Gore · Action · FPS

Left 4 Dead 2
Shared: Action · FPS · Shooter

Resident Evil Village
Shared: Action · Horror · Gore

Trepang2
Shared: Gore · Action · Shooter

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

Blood and Bacon
Shared: Gore · Action · Shooter

Ready or Not
Shared: FPS · Shooter · Horror

Back 4 Blood
Shared: Gore · Action · FPS

Resident Evil Requiem
Shared: Action · Horror · FPS

Killing Floor
Shared: FPS · Action · Horror

Nightmare of Decay
Shared: Action · Horror · FPS

Dead by Daylight
Shared: Gore · Horror · Violent

Dying Light
Shared: Horror · Gore · Action

Wolfenstein II: The New Colossus
Shared: Action · Gore · FPS

Call of Duty®
Shared: Action · FPS · Shooter

Killing Floor 2
Shared: Gore · FPS · Action

Bright Memory: Infinite
Shared: Action · Indie · FPS

Outlast 2
Shared: Horror · Gore · First-Person

Pavlov
Shared: Action · Shooter · FPS

Resident Evil 2
Shared: Horror · Gore · Action

Outlast
Shared: Horror · Gore · First-Person

GoreBox
Shared: Gore · Violent · FPS

DOOM 3
Shared: Action · Horror · FPS