Some thoughts:
1. I don't know if the protagonist is a robot or an alien, but I want to know the simple background story... What happened to the earth? Who is the eye in the sky? Why did the orange mutant fish appear?
2. The fish of medium size in the game are the hardest to find. I have caught all 222 fish. Except for the fish with similar shapes that are easily overlooked, these fish are the hardest to catch.
3. Can the illustration add a special viewing function? I can't observe the whole fish. For example, I caught the orange light 6-eyed giant shark and the giant fish with tumors on its head in the later period, but I have never seen its whole body. (Your pixel pictures are very cool!)
4. About 460 meters, I found something like an eye, it doesn't seem to move... If it's just a circle...
5. The game seems to have only one END? At the end, even if the protagonist becomes an orange-eyed state, it will return to the original state when the "?" is displayed.