You really have to improve the things Nardulus already said. But not in later in Part2 (perhaps)! Do it now as a Patch and take it to your or the publisher's website. Better to have a patched game than a game with many disadvantages in gameplay and fun.

Otherwise, very very good work. I already liked the first demo some months ago, but there, I think, the collosion system was even better than now... I don't know.