Simple game. Auto attack is a very interesting idea. A good music is missing. Shoot sounds are good. Great graphics.
The game name should really be better. Many, many people name their games just like the theme. Maybe "Overpowered Shooter" or "The Overpowered Shooter" if you want the theme in the name.
My rating: Fun 2, Audio 3, Graphics 4, Idea 4, Theme 2