Games like Darkest Depths
Games like Darkest Depths include DOOM Eternal, Paint the Town Red, Gunfire Reborn, BioShock Infinite, and Wolfenstein II: The New Colossus. We matched them by the tags players give Darkest Depths on Steam (Early Access, Action, Violent, FPS, and Roguelite): closest matches first, and among equally close ones the better-known games.

DOOM Eternal
Shared: Action · FPS · Violent

Paint the Town Red
Shared: Action · Violent · Gore

Gunfire Reborn
Shared: Roguelite · FPS · Action

BioShock Infinite
Shared: Action · FPS · First-Person

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

Serious Sam 4
Shared: Action · FPS · Violent

RoboCop: Rogue City
Shared: Action · FPS · First-Person

Quake Champions
Shared: Early Access · FPS · Arena Shooter

Bulletstorm: Full Clip Edition
Shared: Action · Violent · FPS

Maximum Action
Shared: Action · Violent · FPS

DOOM
Shared: Action · FPS · Gore

Call of Duty®
Shared: FPS · Action · Violent

Nova Drift
Shared: Roguelite · Bullet Hell · Shoot 'Em Up

Serious Sam Fusion 2017 (beta)
Shared: Action · Violent · FPS

Bright Memory: Infinite
Shared: Action · FPS · Violent

ULTRAKILL
Shared: FPS · Gore · Arena Shooter

BALL x PIT
Shared: Action · Roguelite · Bullet Hell

STRAFE: Gold Edition
Shared: Action · Roguelite · FPS

Vampire Survivors
Shared: Roguelite · Bullet Hell · Action

Death Must Die
Shared: Roguelite · Bullet Hell · Action

VOID/BREAKER
Shared: FPS · Bullet Hell · Roguelite

Touhou Blooming Chaos 2
Shared: Action · Bullet Hell · Early Access

Sword With Sauce
Shared: Action · Violent · Gore

Bloodshed
Shared: Action · FPS · Bullet Hell