Nicely done.
It took to long to get where it was going, but then again if you did it at a decent pace, it would just be far too short.
Either way, a good conceptual point of view as to what everybody's hard work goes through averagely in the portal; You have potential, you can draw well enough, and you can create decent effects, and animate smoothly. You even included music and sfx, so let's see some Top 50 material from Jonasen, shall we?
You can do it bro! As for this flash? I'm giving it 7/10 and I voted 5. It has passed judgment.
-Phobotech-