Games like Depth Dwellers (1994)
Games like Depth Dwellers (1994) include Half-Life, Quake, DOOM + DOOM II, Half-Life 2, and Half-Life: Opposing Force. We matched them by the tags players give Depth Dwellers (1994) on Steam (Action, FPS, Shooter, 1990's, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Half-Life
Shared: FPS · 1990's · Action

Quake
Shared: FPS · Action · Shooter

DOOM + DOOM II
Shared: FPS · Action · 1990's

Half-Life 2
Shared: Action · FPS · Singleplayer

Half-Life: Opposing Force
Shared: Action · FPS · Shooter

Counter-Strike
Shared: Action · FPS · Shooter

DOOM 64
Shared: Action · FPS · 1990's

Black Mesa
Shared: FPS · Action · Shooter

Half-Life: Blue Shift
Shared: Action · FPS · Shooter

Call of Duty®
Shared: FPS · Shooter · Action

Quake II
Shared: FPS · Action · Shooter

KovaaK's
Shared: Action · Shooter · FPS

Duke Nukem 3D: 20th Anniversary World Tour
Shared: FPS · Action · 1990's

DOOM
Shared: FPS · Action · Shooter

Battlefield™ 2042
Shared: FPS · Shooter · Action

Battlefield™ 6
Shared: FPS · Action · Shooter

BioShock Infinite
Shared: Action · Shooter · FPS

DUSK
Shared: FPS · Shooter · Retro

Bright Memory: Infinite
Shared: Action · FPS · Shooter

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

Titanfall® 2
Shared: FPS · Shooter · Action

Ready or Not
Shared: FPS · Shooter · Singleplayer

SUPERHOT
Shared: Action · FPS · Singleplayer

Wolfenstein 3D
Shared: FPS · Action · 1990's