Oreanta's review is on like Donkey Kong (or it WOULD be if Nintendo hadn't coined the phrase...)
After reading many of your comments and admiring your frequent use of the "XD" and ":P" emoticons (as I, too, often to), I decided that I should write you an honest review. The game itself is much better than most of the rat crap people put on here. Sadly, that's not really saying too much! :O
The real challenge in this game comes mostly from terrible hit tests and a difficult-to-execute jump maneuvre (I was running and jumping at the same time on the "long jump" level and it never seemed to work). Also, every level should start off with the player on a solid platform (some of yours move right from the start!). Also, a player should stick to a moving platform and not have to move with it (this might involve some tricky actionscript, however).
On the bright side, I like the comments you have after each level (you should make them easier to read, though XD ). The scrolling background is nice, but sometimes very confusing and distracting :S. I'd really like to see you try and make your own graphics!
What I say to many game programmers is that you should find a genre that you feel you can build on and try something unique and fun within that. A uniqueness like that makes you much more distinguishable from other game developers who simply do what everyone else is doing because it is easier. I really hope you discover what you can do to improve your favorite genre... I'd like to see what you can do!