Needs considerable work...
I'll admit, the graphics and sound effects were....interesting. But not neccessarily in a good way. It almost sounded like a child was making those explosion noises and the graphics appeared as though the game was drawn on a paper napkin from McDonalds. As for the scoring system, it was ok. However, your programming for it needs revision. I know I missed the enemies with most of my shots, but I got full points for accuracy. Also, "Shoot!?" Really?
If you are going to expand one this, please take the reviews of your original into consideration.