Wow! This is a really good and funny game for such a short time frame! I enjoyed playing it soooo much! The gameplay feels really smooth, I couldn't find any bugs or problems with the gameplay, the controls are intuitive and easier than I expected and the feedback from the UI is really well done! As a completionist, I love the idea of unlocking things and their descriptions (which are also really funny) as you steal them from the boat. It motivates the player to keep playing even more and finding out new things! The only thing I would add here would be upgrades for the fish: more life time, more jump strength or something like that. But that's just an idea for the future to make the game even more replayable. Maybe even more levels (different boats) that you can unlock along the way!
The idea here was extremely creative and a really unique approach to the jams theme! I believe this is what makes this game standout, it's really really funny as well xD
The graphics are really good too! You nailed the old school pixelated visuals (you may notice my bias here since my game has the oldschool look as well ahah). Everything is consistent with the visuals, the animations are simple but great and the UI does its job really well! The music blends in really well with the theme of the game and the general vibe which helps a lot with the imersion.
Overall, you've got an amazing game here! Solid concept that can be easily iterable over time. Insane work for just 4/5 days and surely one of the best games in the jam. Congratulations on your submission!