Great Start!
For your first platformer, this was a fantastic effort, though a little lacking, but that is to be expected for a first attempt. I just thought I'd mention a few things to maybe help you in your future pursuit of frontpagedom.
-Ambience and Sound: There needs to be sound effects, background music and gradual lighting, this would enhance the game worlds beyond its current value.
-Concept and Character Design: For a starting concept, this was good, but it needs more unique "shwing" and the character needs to be discernible rather than just "some guy" a less faulty jetpack would go nicely, too, cos it was kinda fun :)
and finally, an essential part of platformers are Level Design: Your levels are constantly blah and the background doesn't have any altering changes. It needed a detailed sky and maybe a mountain range gradually moving in the background or something, if you know what I mean.
Maybe go back to the drawing board and clean this up a little, i'd love to see a finished version, I think many a person would vote 5 :D. All in all, good start.