UFO Defender

Tap to avoid enemy UFOs and to increase speed. You have to walk 10 Km to get home. The planets and the asteroids won't hurt you. You have five shields (lives). You need to go home as fast as you can. Press your smartphone's back button to quit the game. This game is based on "Tappy Defender", a game from the book "Android Game Programming by Example" by John Horton, Packt Publishing 2015.