Games like Titan Nebula
Games like Titan Nebula include Warhammer 40,000: Space Marine 2, HELLDIVERS™ 2, PRAGMATA, ARMORED CORE™ VI FIRES OF RUBICON™, and The Callisto Protocol™. We matched them by the tags players give Titan Nebula on Steam (Third-Person Shooter, 3D, Action, Third Person, and Futuristic): closest matches first, and among equally close ones the better-known games.

Warhammer 40,000: Space Marine 2
Shared: Action · Third-Person Shooter · Third Person

HELLDIVERS™ 2
Shared: Third-Person Shooter · Action · Sci-fi

PRAGMATA
Shared: Third-Person Shooter · Action · Sci-fi

ARMORED CORE™ VI FIRES OF RUBICON™
Shared: Action · Third Person · Mechs

The Callisto Protocol™
Shared: Third-Person Shooter · Sci-fi · Third Person

Dead Space (2008)
Shared: Action · Sci-fi · Third Person

Vanquish
Shared: Third-Person Shooter · Action · Sci-fi

Warframe
Shared: Third-Person Shooter · Action · Third Person

Warhammer 40,000: Space Marine - Anniversary Edition
Shared: Third-Person Shooter · Action · Third Person

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

Dead Space
Shared: Third-Person Shooter · Sci-fi · Space

STAR WARS™ Battlefront™ II
Shared: Third-Person Shooter · Action · Space

Dead Space™ 2
Shared: Third-Person Shooter · Action · Third Person

Mecha BREAK
Shared: Action · Mechs · Third-Person Shooter

EARTH DEFENSE FORCE 6
Shared: Third-Person Shooter · Action · 3D

Binary Domain
Shared: Third-Person Shooter · Action · Sci-fi

ARC Raiders
Shared: Third-Person Shooter · Third Person · Sci-fi

Grand Theft Auto V Legacy
Shared: Action · Third Person · Third-Person Shooter

Mass Effect (2007)
Shared: Action · Third-Person Shooter · Sci-fi

Titanfall® 2
Shared: Action · Mechs · Sci-fi

Lost Planet™: Extreme Condition
Shared: Third-Person Shooter · Action · Sci-fi

Tomb Raider Game of the Year
Shared: Action · Third Person · Third-Person Shooter

Quantum Break
Shared: Action · Third-Person Shooter · Sci-fi

Star Wars Outlaws
Shared: Action · Third Person · Third-Person Shooter