mehh...
Well, the graphics as most people have said already need some work, try using the rectangle tool less, try adding lights and shadows to your objects, and please try using something other than a stick figure :\
The music was annoying. For one, I didn't like the music anyway, For two, the music kept on playing more than once at the same time. Soon my speakers were on the verdge of exploading. Try making less techno music.
The gameplay was boring. You just attack this guy while running around in a little field. Not that intresting |- (. Try making more than one enimies, and more than one locations.
However, the platforming was smooth and flawless, and it did kill some time, so keep it up! I'm sure you can make good games!