The aiming point will follow your mouse and when no laser balls come out it means you've ran out of ammo so you have to start again. The idea is to kill all the scary monsters ,but they can regain their health so be quick. Tip kill the munchkins before the big boss(the big boss is the black one). The monsters can sometimes turn invisible but the health bars will stay. there.
I spent a long time on this project and a lot of experimenting so I wish all you guys enjoy.