Mmm
It was hilarious, but the portals bugged the crap out of me.
Rather, the fact that the person didn't pass THROUGH the portal, just under it, in a way. I suggest cutting the portal in half, so that the part in the background is on the layer under the figure, and the other half[the half closest to us, the viewer] on the layer above the figure. Then it'll create the illusion that he's passing through it. Masking helps too. But it looks like you got it on the intro screen?
Other than that, it's pretty good. I liked the part when he had the cubes falling out of him: 'yay'