Beatiful! Amazing! Awesome! I mean, really, how many ways can you say the same thing?? (Well, probably at least a dozen more, but that's beside the point). Watching this animation was like watching what my future could be. Your animating style is very lifelike, in the sense that you see the paper folding like it should, you're handling 2D and 3D items very skillfully, and like All4OneAndOne4None said, the "camera handling" is very well done. The scenes and shots are rendered so well; that's what draws you in, makes you keep watching. For a while, I've aspired to animate like this, and your animation shows that it's possible, and in a short amount of time, at that! For effectively using music, beautifully depicting emotions, and making backgrounds that are simple and uncluttered, and yet delightfully drawn, I have to give you major credit and say that front page is where you belong. Ha, and I'm gushing. :D
Short and sweet, there's almost too much good stuff going on here to mention, and the cat!! It's like everything you want in a darkly stealthy house-cat, rolled up into one super-cool animation.