Games like Xotic
Games like Xotic include Black Mesa, Half-Life 2, Starship Troopers: Extermination, Bright Memory: Infinite, and BioShock Infinite. We matched them by the tags players give Xotic on Steam (Action, Indie, FPS, Arcade, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Black Mesa
Shared: Action · FPS · Sci-fi

Half-Life 2
Shared: Action · FPS · Sci-fi

Starship Troopers: Extermination
Shared: Action · FPS · Sci-fi

Bright Memory: Infinite
Shared: Action · FPS · Indie

BioShock Infinite
Shared: Action · FPS · First-Person

Apex Legends™
Shared: FPS · Action · First-Person

DOOM
Shared: Action · FPS · Shooter

KovaaK's
Shared: Action · FPS · Indie

Titanfall® 2
Shared: FPS · Action · Shooter

SUPERHOT
Shared: Action · FPS · Indie

Aimlabs
Shared: FPS · Action · Shooter

Halo Infinite
Shared: FPS · Action · Shooter

Bright Memory
Shared: FPS · Action · First-Person

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

Half-Life
Shared: FPS · Sci-fi · Action

Call of Duty®
Shared: FPS · Action · Shooter

DOOM Eternal
Shared: Action · FPS · Shooter

Half-Life: Opposing Force
Shared: Action · FPS · Sci-fi

Counter-Strike
Shared: Action · FPS · Shooter

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

Half-Life: Blue Shift
Shared: Action · FPS · Sci-fi

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

PUBG: BATTLEGROUNDS
Shared: FPS · Shooter · Action

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Sci-fi