Games like Death Rattle - Hell Unleashed
Games like Death Rattle - Hell Unleashed include DOOM Eternal, DOOM, Trepang2, Ready or Not, and BioShock Infinite. We matched them by the tags players give Death Rattle - Hell Unleashed on Steam (Destruction, Shooter, Horror, Violent, and Gore): closest matches first, and among equally close ones the better-known games.

DOOM Eternal
Shared: Gore · Violent · Shooter

DOOM
Shared: Shooter · Gore · Demons

Trepang2
Shared: Shooter · Horror · Gore

Ready or Not
Shared: Shooter · Horror · Violent

BioShock Infinite
Shared: Shooter · First-Person · Action

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

Bright Memory
Shared: Shooter · Hack and Slash · First-Person

Bright Memory: Infinite
Shared: Shooter · Hack and Slash · Gore

Call of Duty®
Shared: Shooter · Violent · Singleplayer

Left 4 Dead 2
Shared: Shooter · Horror · Gore

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

Battlefield™ 1
Shared: Shooter · Destruction · Singleplayer

Wolfenstein II: The New Colossus
Shared: Gore · Violent · Shooter

Killing Floor 2
Shared: Gore · Shooter · Horror

Back 4 Blood
Shared: Shooter · Gore · Horror

The Darkness II
Shared: Shooter · Gore · Horror

The Forest
Shared: Horror · Crafting · First-Person

RoboCop: Rogue City
Shared: Shooter · Gore · First-Person

Middle-earth: Shadow of War
Shared: Violent · Gore · Singleplayer

Just Cause 4 Reloaded
Shared: Destruction · Shooter · Violent

Metro Exodus
Shared: Horror · Shooter · Singleplayer

People Playground
Shared: Gore · Violent · Destruction

Blood and Bacon
Shared: Shooter · Gore · Horror

Chivalry: Medieval Warfare
Shared: Medieval · Gore · Violent