Nice!
Sensitivity is maybe too high, even if there's the slider to regulate it. Fish and the harpoon mechanics and graphics are really cool. You should also try to add a tutorial or an explanation, because it was a coincidence for me to find out how fish were exchanged for money, by pressing the E button. Water SFX is excelent, but music is completely absent. I don't know if it was a bug or a developer choice not to add it, in that case, consider add music. UI is skinny, but does its job. Said that, the game is really beautiful and has a great potential.