varmints

Summary:
A rabbit-like varmint was living happily in the nature full of plants. However, one day, the many varmints came and built a civilisation. The natured died away leaving one branch that the varmint saved. Taken away his place of living, the varmint had to become a part of the civilisation, and in the contaminated city, he keeps growing his single plant. Many varmints died because of the air pollution and the hard labor, and the varmint notices a jellyfish-like something appearing in places of the city. One day that "something" flies in the sky and collects the varmints. In the jellyfish, there is no contamination, and it is full of nature.

Message:
I did not understand the story clearly. However, I think it is symbolising today's world that is destroying the nature to develop civilisation. The message is that the dystopian world in the animation might become our future; people dying because polluted air and destroyed nature. To prevent this, we must cherish nature and prevent from them being harmed because of human activity. The jellyfish-like "something" is heaven, in my opinion. I think it is actually bad ending, and they all died after being harmed their health. We have to do something before it becomes too late. One thing that I did not understand is the fact that only the rabbit-like varmints were onboard the jellyfish. It must have a meaning, but I can't figure it out. Is it a racial something? Somebody please help...