My overall take: An alright 90s environmentalist movie, but doesn't present much new for the genre or the franchise. In this movie, Nobita sleepwalks to another planet, where he and his friends meet a civilization of anthropomorphic animals. I always came away from this one with the feeling that it doesn't do a whole lot with the concept of an animal civilization. Instead, the animal planet mostly serves as set-dressing for a 90s environmentalist story. ("Look, their society runs entirely on renewable energy and synthesizes food from sunlight and air and releases no waste into their environment!") And it's a very 90s environmentalist story: the peaceful animalsliving in harmony with their environment are threatened by mysterious aliens, who turn out to be humans whose ancestors had already devastated the natural resources on their own planet (not Earth). Not to worry though, because the ending reveals that there are also good humans from that planet who oppose the aspiring conquerors and are working to restore their home!

The main characters do enough to justify their presence in the narrative, but none of them receive much characterization except maybe Gian, who gets to showcase a more vulnerable side of himself that isn't seen often. However, even that doesn't end up affecting the plot substantially.

Ultimately, I think this movie is okay for what it is. It has little in the way of what I'd consider to be actual flaws, but at the same time, I feel like it doesn't bring much new to the table.