The background was actually pretty awesome. The bubbles would get bigger and then shrink and keep repeating until the end of this short music video. Also what is the character's name anyways? They looked like they were having a lot of fun just randomly popping up all over the place here.
Also liked that variation of the song. I know the original is a vocaloid song but I can't remember the name of it despite having it on my iTunes (then again it's still in kanji instead of english at moment).
Overall though, very short, nice graphics. Excellent work here.