A strong start at NG!
I must say...the animation is very fluid in your video. Although it doesn't make a world of sense, the fact that you put that much work into to your flash creations only opens the door to many possibilites for your future work.
There are only a few things, if any, that could be done to make the video a little better. The music, to me, didn't seem to really flow with the video all that much. The music for the fight against King DeDeDe in the seirously old game 'Kirby Super Star' probably would have been my choice in Kirby music for the video. That's just my preference, though.
A plot/series would be nice too, but it really isn't necesary for your style of animation and probably wouldn't increase it's popularity all that much. I must say I was surprised to discover this was a video about Nintendo's pink puffball...
All in all, great work. I'll be watching out for your next!