This is the start of something new. It's perfect. It's hard to see a future where this movie, and this trilogy, will not be the magnum opus that every artist in the next generation of animated film points to as their inspiration. It clearly comes straight from the heart, and goes straight to it as well, all while being an incredibly fun experience for every second it asks of you.
There's not a piece out of place. See it in theaters while you can. It's worth it.