This looks interesting. From a visual construction standpoint the characters could stand out from each other and the environment a little better at times. A small color adjustment in their design would accomplish that. The animation works because the style of the world is visually detailed, but subjectively fantastical. This gives the animation some room to breathe- it doesn't have to be as tight or as highly polished as something that looks more 'normal' or recognizably real-ish. This was a very wise choice for a lower budget film because that other high polish style of CG animation is very expensive. The visual world and the motion work well together in a more interpretive and fantastical way. Never under-estimate the power of visual and motion harmony. Story-wise this isn't your typical fluffy talking animal movie. Which is a good thing. It remains to be seen how that fact will impact it in the box office. If it can make Coraline or Despereaux kind of money then I think it's a success and will mark the continuing expansion of what commercially viable CG animated films can be.