I really liked the game and the BGM used. Though the aesthetics are rudimentary, I think it fits the theme. The bobbing boat also gives it a feeling of fluidity and attention to detail.
I agree that the clock is too rare, and it's unfortunate because I would like to play the game more. I think another issue is that the objects can overlap each other, which doesn't look visually-appealing and also affects gameplay.
Inspired by what FortuneCosmic said, maybe bigger/rarer fish take longer to reel up, and there's a level of risk involved because your line can be interrupted by other incoming fish.