My first flash review :D
As Shanus said, the animations look rather simple and need some work - for instance I could'nt tell what that thing was until fire burst out of it (rocket). Simplistic is good but some of the animations need some polishing.
What I really like is how the music syncs with visual events, especially in the intro. The various visual styles are nice too. It'd have been cool if the little guy had visited a few more places, but of the existing ones the piano scene was my favourite.
Nice stuff, just throw in more variety, spend a little more time on the animations and I'll be happy to give it a 10/10