While very simplistic and predictable at all points, it is rather "cute".
It handles its emotional core very well, with the characterizations and voice-acting
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being the best part (as well as the excellent vibrant worldbuilding).. but the content is so sparse it makes the pacing feel sluggish and the film a tad long. As a romance, it's okay and delivers on its premise! The other layers, like the "looming threat", are a second-thought and a mark that needed to be checked.
As a Pixar movie and after 7 years of development? I'm not sure.. I guess I expected more from the narrative. Had this been done by a smaller and newer studio, I can imagine only praises. Maybe just say