Sale has ended but you can still get this app.
Download Touch Gun Mobile! Now
Touch Gun Mobile!

Official Description

You play as an Anti-Aircraft gun to protect your island from the invading airplanes. Shoot down all the airplanes by tapping them. Lucky for you, the airplanes are old and not carrying guns or bombs, their only mission is to crash into your island and destroy you! Their strategy gives you the time to shoot them all down! The big airplanes have more armor,you will have to shoot them more than once! Good luck brave defender