The atmosphere / graphics of the game are awesome! They really set a cool mood for the scene, that works well with a peaceful and somewhat eerie fishing minigame.
The minigame itself was a bit monotonous, though I think that it is supposed to be that way to an extent since the player is given a choice to leave if it gets too tiring. One thing you could possibly add to spice up the gameplay a bit would be to have randomly spawning areas where the player fishes that have a higher likelihood of spawning a fish (like in either Stardew Valley or Core Keeper). That could maybe help keep the player engaged while taking in the atmosphere.
Great work on the jam!