UFOs attack

UFOs attack is a fast, adictive and enternained game to some kill time.The alliens are coming to Earth to steal all the cows from earth. Your mission is to save all the Cows from the the evil visitors.Destroy all the UFOs and allow this world to be happier :DMore levels and worlds are coming.INSTRUCTIONS:- When the alliens are capuring a cow, destroy them by touching the UFO.