If you have seen the first movie, this movie will feel very familiar in regards to the plot line. On top of this, there are several moments in the movie that are blatant uses of animations from the first movie. If you watch the movies back to back, these stick out like a sore thumb.
Aside from this, the story is fun, and the visuals are beautiful. If you liked the first movie, I am sure that you will enjoy this one. I just wish that after 10 years, they would have made this more of its own thing. And the reuse of animations blatantly is just flat out not acceptable.