The Earth is being attach by others planets force. The Earth defense force have to come outside the earth zone to fight. They try to attach the earth In search of resources that are no longer provided on their planets. Take command of the defense force, jump on the most powerful ship and fight them all with special weapons to hold your defense against endless waves of enemies on the hostile alien planet.Earth Defense is the combine of the sky force gametype and the classic defense games to a whole new gameplay.***** Earth Defense Features*****- Diversified enemies- A large number of aggressive enemies to fight against- 4 types of power up- Infinity mode- Addictive gameplay, gorgeous graphics and great soundtrack- Leaderboard to compete with friends.Hope you enjoy the game.