Games like Space Defender: Frontier Squadron
Games like Space Defender: Frontier Squadron include Starcom: Unknown Space, Starfield, The Witcher 3: Wild Hunt — Remastered, The Ascent, and Elite Dangerous. We matched them by the tags players give Space Defender: Frontier Squadron on Steam (Twin Stick Shooter, Action RPG, Space Sim, Space, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

Starcom: Unknown Space
Shared: Space · Space Sim · Action RPG

Starfield
Shared: Space · Open World · RPG

The Witcher 3: Wild Hunt — Remastered
Shared: Open World · Story Rich · RPG

The Ascent
Shared: Top-Down Shooter · Twin Stick Shooter · RPG

Elite Dangerous
Shared: Space Sim · Space · Open World

Mass Effect™ Legendary Edition
Shared: Space · Story Rich · Action RPG

LEGO® Star Wars™: The Skywalker Saga
Shared: Space · Open World · Local Co-Op

Starcom: Nexus
Shared: Space · Space Sim · RPG

No Man's Sky
Shared: Space · Open World · Sci-fi

HELLDIVERS™ Dive Harder Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Local Co-Op

EVE Online
Shared: Space Sim · Space · Open World

Black Myth: Wukong
Shared: Action RPG · RPG · Story Rich

Fallout: New Vegas
Shared: Open World · RPG · Story Rich

Rebel Galaxy
Shared: Space · Open World · Space Sim

Cyberpunk 2077
Shared: Open World · RPG · Story Rich

Warhammer 40,000: Inquisitor - Martyr
Shared: Action RPG · Space · RPG

Tainted Grail: The Fall of Avalon
Shared: Open World · RPG · Action RPG

Mass Effect (2007)
Shared: Space · RPG · Story Rich

Gujian3(古剑奇谭三)
Shared: Action RPG · Story Rich · RPG

The Outer Worlds 2
Shared: Action RPG · Open World · RPG

Fallout 4
Shared: Open World · RPG · Story Rich

Monster Hunter: World
Shared: Open World · Action RPG · RPG

Dragon's Dogma 2
Shared: Action RPG · Open World · RPG

Starpoint Gemini 2
Shared: Space · Space Sim · Open World