Okay so I just finished this and I really liked it. That being said I also had some problems with it.
Heres what I liked:
-The art style is great! I especially like that the small fish sprites look like first generation tamagotchi renders. Plus i was always excited to see the close up image of each fish.
-The music is awesome! I really liked that as you played the track got more complex with yur progress.
-The upgrades are super unique, the fly swatting is a really cool idea especially.
Heres what I had problems with:
-The camera noise is pretty grating, it motivated me to upgrade it fast, but by the time I had it maxxed out I was already super sick of it and it was still playing way too often.
-Upgrading the chum at a certain point is detrimental to you because it makes it harder to dodge the cheap fish to get low enough to catch what you actually want, especially once your reel is fast.
-the random (?) chance to catch extras or whatever it is that makes me catch fish out of nowhere was more often than not, detrimental to me, it was very frustrating to try and fish for deep creatures and have a single slip up where i accidentally catch a gulper and somehow 3 of my five hooks are full
-Not enough labelling!!!! This is probably the biggest issue I had playing the game, if you change anything about the game let it be this. All the time, things happen that are unintuitive. When I catch extras, it would be nice to see a little popup that says double! or triple! or something like that. The puzzle was a cool little addition but I didnt figure out what it did until I had done it a few times.
-Until you get to the final two fish, the puffer is the most valuable fish, and it can easily caught without going deeper than the main screen. It feels like buying fishing line was largely useless, as the seconf I realised that the deeper fish weren't as valuable I came straight back to the surface.
Anyway, for a game made in only ten days, this is pretty impressive. These suggestions really don't apply to anything that wasn't designed to be super polished. It probably doesn't seem that way after reading all of that but I really did love it and I think it has serious potential.