A refreshing story with great message, but unfortunately, I can't relate to it fully

Rating: 7/10 (7 February 2016)

It has amazing refreshing plot and new setting in animation world. It has overall great message, that happiness is great, who don't want happiness in your life? But sadness is important in your life too, if you doesn't feel your sadness, your feeling will be empty because it means you are no longer have that feeling that makes you feel human.
Unfortunately, I get that message only at the end of the movie. I start to feel the character after The center of the plot get to our main girl feeling. For the rest of the movie, from first act to second one, I don't feel attached to any of the character despite I already know the messages they want to convey. I disagree if someone said this movie is not popular because it touch sensitive issues that children don't understand, It's the opposite, this movie is easy to understand and really made for children around 9 - 12 years old if your children are smart enough.
I's a good movies, just lack character attachment like Toy Story gave me.