This video was sad and gloomy. The varmint was living in its own world for a while but then the antagonists come into the scene and destroy its home. It's what humans are doing right now. Humans are destroying habitats of many different animals for their own selfish reasons. Factories are ruining oceans, and polluting the atmosphere. This sort of focused more on the fact that varmints (animals) have emotional feelings and are affected as equally as much as anything else. Humans tend to think that animals are lower than them in terms of the animal kingdoms. Though that is wrong, even humans will not be able to live without the help of other organisms and vice versa. I think this video is telling us that humans are being too selfish and is required to think more about others. They need to stop destroying every open space, and natural habitats for their own selfish reasons.
In the end we see the varmint go into this huge jellyfish like thing, I guess it resembles peace and harmony and what is considered 'ideal'. It's probably an environmentalists wishes and hopes of having an undestroyed world once again.