Review Detail of GuzaSan in Evolving into a Great Dragon From a Koi Fish

The prompt is MC was killed by a humongous fish that ate the cruise ship he was on as a part of some kind of evolution a lot of animals and humans were going through because of presumably nuclear waste but it seems to have more to it. MC needs to eat to evolve and it just seems a little boring to me. His little sister and her friend are in a good relationship with him and the main plot is about everything that's evolving in the world including humans which leads to various situations. The first 18 chapters weren't very interesting, the strength margins with each evolution he's going through are very small, all in all, just doesn't seem very interesting. It's not even that it's too slow-paced it's just that he's a fish, and he needs to eat food to evolve. The only real stimulation i can think of here is him protecting his sister and her friend but this is also not interesting at least to me. TL: DR - MC is a fish that needs to eat to evolve. Seems boring after 20 Chapters. Wouldn't recommend