Good for a first attempt.
For starters, I think you may have been better off using a version of the song that didn't have the sound effects from the show since they sounded out of place about 85% of the time.
As for the animation, it's not terrible, but the elements (Such as the window and the background on that zoom in at the beginning) often clash and many moving objects are tweened so hard it's almost painful to watch. Motions also fell out of sync with the music a few times too. But I'm trying to keep in mind that you've been at Flash for a grand total of like 5 weeks so I won't be too harsh on that point. And props for hand drawing the stuff.
Overall, I'd say it's a good start and shows that you definitely have the resolve to take up big projects, and I'm looking forward to hopefully seeing you improve in the future.
P.S. Did Fluffy do that preloader? Looks nice.