Fortified

"Fortified is a thrilling strategy shooter set in a 1950s retro sci-fi world, where players defend Earth from a Martian invasion. Combining third-person shooter, real-time strategy, and tower defense mechanics, players can enjoy single-player, co-op, or multiplayer modes, building defenses and wielding an arsenal of Cold War-era weapons. Protect the city against towering attackers and experience an exciting blend of gameplay styles for a unique and immersive adventure."