Alien: Doodle UFO, iOS iPhone, FREE for a limited time
 

Alien: Doodle UFO [apple.com] iOS iPhone, FREE for a limited time.

Game Story
Aliens are attacking, and the battle for the survival of humanity is at hand! It's up to you to defend your entire planet. With all modern weapons already destroyed, you must manage to kill the enemy with nothing but an ancient slingshot, mysteriously placed under your bed by an unknown force. Rush through the levels and destroy the enemy with your all-powerful slingshot before it's too late!