Okay, this was really neat! It felt like a music video more than anything, given that there wasn't much story other than Kirby has a dream. I really liked the zooming in on the pixelated objects, I don't see that done much in flashes. I also like that you attempted to draw and animate Kirby as well, rather than using his sprite only.
The only complaint I have is that the backgrounds seemed kind of bland for a "dream" of sorts. One would expect more colorfull, random backgrounds in a dream of Dreamland. Maybe giant lolipop trees and apple watter wheels or just a general light and fluffy candy filled dreamscape.
I really liked what you did here, with the music and the animation, I just feel like it could have been more vivid. 3.5 stars for you, sir.