Not bad
Better than all the crap I make. Oh and Kiaros... the one that reviewed earlier. THIS IS A GAME IDIOT! anyways.. things you could improve apon:
1. Conviniently "Borrow" the sound track from the spider man game. That'll add some sound, oh and find sound clips to you can download some from stuff from shareware software like kazaa (I personaly wouldn't use THIS but it's your choice..) and get sound clip folders.
2. If you have the effort (I know I didn't when making my now non existance due to blamming flash) try adding little collecting items that give you a score or something to give a little bit more of an objective to it. I wouldn't bother with making enemies it takes too long scripting a whole nother character that has to move on their own.
And finaly 3. Just try adding stars to the background (Not dots.. actual star shapes) That WILL add so much more to your graphics score... trust me just a small little alteration to detail will work wonders. Oh and windows on the buildings too! (If you really think about it it does seam a little downing but thats what Ctrl+V is for)