Varmint

Summary:
varmints lived in nature, sustainably and peacefully. The protagonist looked like a botanist, as he was sampling plants. It is clear that the protagonist has a strong affection for plants and nature.
Then, there comes a huge fortress, pulled by a lot of urban varmints. They look so much less healthy than the normal varmints, and they almost look like they are enslaved by the fortress. The fortress destroys the nature, and the protagonist had to live there with a branch of tree which he was barely able to bring in.
Inside the fortress is dusty, heartless city. Varmints live in small apartment rooms and they are all ill. The protagonist’s branch is the only nature to be seen. After some time, the protagonist becomes ill just like others, and right when he was about to die, he was rescued by a mysterious jelly fish.

Ending:
The ending can be interpreted in many ways. It could be symbolizing the life after death, or return to the country side. One thing for certain is that the city remained there. It’s not like varmints changed the way city is, and improved the life for all.
I think it is obvious that the fortress symbolizes the civilization and all the destruction it caused. Varmints used to live harmoniously with the nature but after civilization, they started to harm the environment and themselves.
It is also important to note that the jellyfishes emerged from inside the city. They grew inside the apartments, and did not came from outside. I think jellyfish symbolize technology. The technology that allowed some varmints to live a healthier lives again.
In real life, humans are like varmints. We used to live harmoniously with the nature, but we started destroying them. Then, some country moves on to tertiary industries. People in developed countries will start living a healthier lives, somewhat sustainably. However, there always remain developing countries, who would destroy the environment instead of them.