well, people are allowed to point at your game's mistakes. if you dislike constructive criticism then just DON'T upload your demo, ok? ps. improve your graphics. and your buttons barely work.
very nice use of the shootorial, great graphics and music. congratulations! although, i wish it was a little bit easier to level at first, you know.. you could make the difficulty go up gradually, you know? so we would not die so fast. but the levels thing is a great improvement, and the health too.