You managed to get a lot out of the one-button mechanics! Nice idea to augment the casting by how long you hold space. There wasn't a lot to it once you see how that and the reeling minigame works, but I think there's something to be said for keeping things simple. Was there any difference in the difficulty based on the size and/or speed of the fish? If there was, I couldn't tell, so maybe making the difference more obvious would be one way to improve. I liked the pixel art and the music, definitely brought an old-school feel. I could imagine a bored kid that was dragged along with the family to a remote a fishing lodge for tourists finding this game cartridge in a dusty cabinet that hasn't been opened since the mid '80s and firing up the old tube TV in the dark, musty den to play it while the others are frittering away at the lake.