Relentless waves of powerful Voids are closing in from all directions. A lone commander, armed with nothing but a single gun, stands against them! That unmistakable thrill—classic Random Tower Defense gameplay! Now easier, more exhilarating, and irresistibly fun! Enjoy Galaxy Defense : Coop TD! ?️ on mobile! Summon, Swap, and Merge! Summon mighty Mythical Allies and annihilate your enemies! ? Three Unique Races! - Humans! – Master advanced technology for wide-range attacks! - Mutants! – Crush foes with deadly tentacle strikes! - Aliens! – Harness psionic energy for devastating area attacks! ?️ Random Tower Defense Mechanics! ️ - Summon! – Find the perfect spot for your defenses! - Swap! – Adapt to the situation in real time! - Merge! – Fuse heroes to unleash overwhelming power! Can you save the universe from the Voids? Do you have what it takes to become the ultimate commander? An...