Haha, well, that's quite a bizzare animation, isn't it? xD I like how ridicilous everything looks, makes it more funny and less serious. I also like that we like see different aspects of the character's life, which at first show some sort of funny conflict, and then it gets even more funny as we see the characters just singing like that and coming into that "dance scene" in between the flashbacks.
Overall, everything was done very well, the animation is smooth, the art style shows excellent use of colors and the voices were very beautiful, props to the singers and just everyone who participated on this! ;D