Games like KARNAL
Games like KARNAL include Counter-Strike 2, CULTIC, DOOM, Ready or Not, and Trepang2. We matched them by the tags players give KARNAL on Steam (Action, Shooter, FPS, Boomer Shooter, and Difficult): closest matches first, and among equally close ones the better-known games.

Counter-Strike 2
Shared: Shooter · FPS · Action

CULTIC
Shared: Shooter · FPS · Boomer Shooter

DOOM
Shared: Action · FPS · Shooter

Ready or Not
Shared: FPS · Shooter · Action

Trepang2
Shared: Shooter · FPS · Action

DUSK
Shared: FPS · Boomer Shooter · Shooter

BioShock Infinite
Shared: Action · Shooter · FPS

HROT
Shared: FPS · Shooter · Boomer Shooter

Black Mesa
Shared: Action · FPS · Shooter

Call of Duty®
Shared: FPS · Shooter · Action

DOOM Eternal
Shared: Action · FPS · Shooter

Counter-Strike
Shared: Action · FPS · Shooter

F.E.A.R.
Shared: Action · FPS · Shooter

Warhammer 40,000: Boltgun
Shared: FPS · Boomer Shooter · Shooter

Serious Sam: Siberian Mayhem
Shared: Action · Boomer Shooter · Shooter

Counter-Strike: Source
Shared: Shooter · Action · FPS

Quake
Shared: Action · FPS · Shooter

Half-Life 2
Shared: Action · FPS · Shooter

KovaaK's
Shared: Action · Shooter · FPS

METRO Last Light Redux
Shared: FPS · Action · Shooter

METRO 2033 Redux
Shared: FPS · Action · Shooter

SUPERHOT
Shared: Action · FPS · Shooter

Half-Life
Shared: FPS · Shooter · Action

Devil Daggers
Shared: FPS · Action · Difficult