A classic aircraft shooting game. Defend Earth is an iOS game inspired by the work of Ray Wenderlich. However, this version is more complicated as I have implemented more action events, animation, physics properties as well as adding sound effects.
You can see more of the original inspiration here: https://www.raywenderlich.com/119815/sprite-kit-swift-2-tutorial-for-beginners
Credit Images:
Asteroid: by https://www.cgtrader.com/signSTUDIOS
Missile: by http://www.clipartkid.com/moving-animated-rocket-cliparts/
The Earth: http://s3.amazonaws.com/production.mediajoint.prx.org/public/piece_images/391355/earth__1_square.jpg
Background: http://i1.wp.com/leipglo.com/wp-content/uploads/2016/06/Space.jpg?fit=1020%2C576
