Aliens are attacking the human world! Your life is threatened! You will only have two choices: kill or be killed. Fight as a brave hero to save the human with UFO Attack TD now! What are you waiting for? Show off your talent by shooting down all UFOs in the sky. Especially, be careful with waves of enemies because they often appear in a large number. Try your best to collect as many coins as possible and upgrade your power in the game. Are you ready to fight? Discover it right now! Good luck!