Games like Space Attack
Games like Space Attack include STAR WARS™ Battlefront™ II, Door Kickers: Action Squad, STAR WARS™ Battlefront II (Classic, 2005), BioShock Infinite, and Hotline Miami. We matched them by the tags players give Space Attack on Steam (Action, Shooter, 2D Platformer, Top-Down, and Retro): closest matches first, and among equally close ones the better-known games.

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

Door Kickers: Action Squad
Shared: 2D Platformer · Action · Retro

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Space

BioShock Infinite
Shared: Action · Shooter · Singleplayer

Hotline Miami
Shared: Action · Top-Down · Retro

Half-Life 2
Shared: Action · Shooter · Singleplayer

BONEWORKS
Shared: Action · Shooter · Physics

Call of Duty®
Shared: Shooter · Action · Singleplayer

Mass Effect™ Legendary Edition
Shared: Action · Space · Character Customization

Halo Infinite
Shared: Shooter · Action · Singleplayer

Grand Theft Auto V Legacy
Shared: Action · Shooter · Singleplayer

Aliens: Fireteam Elite
Shared: Shooter · Action · Character Customization

Battlefield™ 2042
Shared: Shooter · Action · Singleplayer

Just Cause™ 3
Shared: Action · Shooter · Singleplayer

HELLDIVERS™ 2
Shared: Shooter · Action · Space

Strike Force Heroes
Shared: Action · Shooter · Character Customization

Halo: Spartan Assault
Shared: Action · Shooter · Top-Down

Hotline Miami 2: Wrong Number
Shared: Action · Top-Down · Retro

SANABI
Shared: Action · 2D Platformer · Singleplayer

Call of Duty®: Infinite Warfare
Shared: Action · Shooter · Space

Mass Effect (2007)
Shared: Action · Space · Shooter

Battlefield™ 6
Shared: Shooter · Action · Singleplayer

Bright Memory: Infinite
Shared: Action · Shooter · Singleplayer