It is a very good summary of environmental pollution, one of the biggest problems of our time, I think it's a great idea to tell it over the sea.
I think the animation is very good. It reminded me of Love, Death & Robots. I wish it was longer, 5 6 minutes. The design of the fishes and the bird was great, but I could have been more satisfied if the length was longer.
In short, I think it's overlooked (for me at least) if only we could watch more movies focused on the environment. Even though I only see this issue in a few environmentalist TV series today, it should definitely be covered in productions other than documentaries.