Games like Terrorform
Games like Terrorform include DOOM, Titanfall® 2, DOOM Eternal, Half-Life 2, and Black Mesa. We matched them by the tags players give Terrorform on Steam (Action, FPS, Old School, Shooter, and Arcade): closest matches first, and among equally close ones the better-known games.

DOOM
Shared: FPS · Action · Shooter

Titanfall® 2
Shared: FPS · Shooter · Action

DOOM Eternal
Shared: FPS · Action · Shooter

Half-Life 2
Shared: Action · FPS · Shooter

Black Mesa
Shared: FPS · Action · Shooter

Call of Duty®
Shared: FPS · Action · Shooter

BioShock Infinite
Shared: Action · FPS · Shooter

Ready or Not
Shared: FPS · Shooter · Action

CULTIC
Shared: FPS · Action · Old School

Battlefield™ 2042
Shared: FPS · Shooter · Action

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

Half-Life: Alyx
Shared: FPS · Shooter · Action

Call of Duty®: Black Ops III
Shared: FPS · Action · Shooter

Trepang2
Shared: FPS · Shooter · Action

Left 4 Dead 2
Shared: FPS · Action · Shooter

Counter-Strike
Shared: Action · FPS · Shooter

Halo Infinite
Shared: FPS · Action · Shooter

DOOM 3
Shared: FPS · Action · Shooter

RoboCop: Rogue City
Shared: Action · FPS · Shooter

Call of Duty®: Black Ops II
Shared: Action · FPS · Shooter

Starship Troopers: Extermination
Shared: Action · FPS · First-Person

STAR WARS™ Battlefront™ II
Shared: Shooter · Action · FPS

Wolfenstein: The New Order
Shared: Action · FPS · Shooter

Aimlabs
Shared: FPS · Action · Shooter