Strange day for a cat to be reincarnated as a fish. This animation has a captivating pull. I admit I was unimpressed from the start, but there was enough details for provoking curiosity, which I ascribed to the character and setting design, and my audience was pulled.
As I watched, I could not overlook the slow framers-per-minute rate. Although the design is appropriate, it is not something at which an individual would look typically for aesthetic appeal. Because of that, It is similar to a work-in-progress than a finished, consciously made decision when one has to look at each individual frame.
Aside from that, everything else is pretty much solid. The ambiance is well established. The sound effects are realistic enough, though at times the bubble SFX is a bit too prominent and the accident could have been made more dramatic. The plot is satisfying, having an understandable exposition, rising action, climax, falling action, and resolution. And the concept makes for a great series.
I would personally like to see more of this.