Save the city, save yourself! Prepare for the attack of your enemies and their allies - The aliens! Remember, sky is no limit, only your braveness. Features: - improve your helicopter to become stronger, fly faster and hit harder - use different weapons to defend the city - evade enemy bullets by swiping - collect the coins to refill your ammo - complete all of achievements and compete with players all over the world Tip: Swiping on the left side is less sensitive, swipe on the right side to shoot a bullet before evading!