Games like Red Siren: Space Defense
Games like Red Siren: Space Defense include Marvel Rivals, Warhammer 40,000: Space Marine 2, PRAGMATA, The Callisto Protocol™, and Tomb Raider Game of the Year. We matched them by the tags players give Red Siren: Space Defense on Steam (Action, Casual, Robots, Shooter, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Marvel Rivals
Shared: Action · Hero Shooter · Third-Person Shooter

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

PRAGMATA
Shared: Action · Robots · Third-Person Shooter

The Callisto Protocol™
Shared: Shooter · Action-Adventure · Third-Person Shooter

Tomb Raider Game of the Year
Shared: Action · Action-Adventure · Adventure

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

Escape From Duckov
Shared: Action · Shooter · Looter Shooter

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

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

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

Star Wars Outlaws
Shared: Action · Action-Adventure · Shooter

Rise of the Tomb Raider™
Shared: Action · Action-Adventure · Adventure

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Third-Person Shooter

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

REMNANT II®
Shared: Action · Shooter · Third-Person Shooter

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

OUTRIDERS
Shared: Action · Shooter · Third-Person Shooter

Binary Domain
Shared: Action · Robots · Shooter

Just Cause™ 3
Shared: Action · Shooter · Third-Person Shooter

Wild Assault
Shared: Action · Shooter · Hero Shooter

Marvel's Guardians of the Galaxy
Shared: Action · Action-Adventure · Third-Person Shooter

UNCHARTED™: Legacy of Thieves Collection
Shared: Action-Adventure · Action · Adventure

Plants vs. Zombies: Battle for Neighborville™
Shared: Shooter · Casual · Hero Shooter

Vanquish
Shared: Action · Shooter · Third-Person Shooter