It wasnt that bad
I would've liked it better if it wasn't giving the impression that it was going to be a Son of Magical Trevor's parody
It was interesting that you only used only sound effects instead of traditionally choreographing the movements to a song.
Good for a first flash, when using sound effects assign them to a separate layer and in the music properties, make it stream.
Also, when using tweens to shrink movie clips please don't use movie clips that change while they shrink/grow (the eyes blinking while they were getting smaller) it doesn't look right. (however this is apposed to the movie clip changing colors, now that is cool while it shrinks/grows).
It would've been all-around better too if the artwork were a little more better until the "paper world" came around. (like the environments weeble-stuff use)
I hope that criticism is constructive enough. 4/5 (not gonna be offensive, yet gonna give you something to aim for)