Could do with a lot of practice
Not a bad flash in itself, but you need a lot of practice.
Firstly, graphics aren't the worst, but they could easily be better. Better shading, better lineart, better backgrounds, mainly the backgrounds. Line tool is something you should rarely ever use.
Animation is choppy and pretty badly done. There's no realism in it whatsoever, and walking animation looks way off. Everything looks fairly flat, there's no depth to the animations.
Sound isn't too bad, the quality is okay, but you should add sound effects.
Cheers
KAG