Nonstop Shoot - Halloween Ver at Mac App Store analyse

Halloween is coming, The world is threatened by monsters and devils that unleashed from Hell. They are killing people and everyone is so scared, they cant be destroyed by normal weapons. The Legend said that only secret Cannon can do that. It has special power that once fired it cannot be stopped! But only a real Hero can use it. Now its on your hand, prove that you are a Hero, Lets kill them all and save the world.