I dig a fishing game with actual progression. Although at first I found the fishing to be frusturating and difficult to aim, I soon realized the difficulty was perfect. Eventually I got the feel for the targeting and timing. I really appreciate how suprisingly deep fishing games like yours can be. Also the amount of depth there was to the variation of the island was really cool. I was a bit worried it would all be sand but as soon as I saw green I was hooked for more. The animation for casting the hook was top notch as well!
Honestly I would not change anything with the fishing system and how the collisions are working as they currently feel great once you get used to them. The two things I really wish this had were, being able to reel in quicker as a missed shot really took a temporal toll. Also the last thing which really wasn't within in the scope of the jam would just be more flotsam variations. Overall though, loved this idea! Solid art, solid gameplay loop, and solid progression fitting perfectly into the theme.