I love the idea. The controls for reeling the fishing line are awkward. Since fishing is the main part of gameplay, the controls shouldn't just be holding a button, but I certainly think there is a way to streamline the input/controls without dumbing down the interaction.
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Yeah, especially on keyboard it's literally painful. Maybe I should have put a "Controller highly recommended" prompt. :D
Even still, it depends on the controller itself how good the reeling will feel. On mine the entire D-pad is one solid platform, so "rotating" it takes some force, but it's doable. Still way harder than the joystick, which is the best experience in my opinion. Not very gameboy-ish though, since that thing didn't have a joystick. :D