I spent about 40 minutes trying to unlock everything. So really fun game, but it needs a lot of polish and balancing. Capping the amount of cash that can be earned in the beginning to 15 and 45 makes it take a lot longer to get anything. It would be nice if cash correlated with points better. Sometimes I forgot to buy anything in the shop, and then couldn't go back to buy what I missed. I went straight to fins, skipping over the fishing pole, because I thought it would help me more, but then missed out on the fun of the fishing pole.
Hiding a secret, or better fish at the bottom would be nice.
Jellyfish being good for points instead of stinging you is a little counterintuitive. Also the guy giving a thumbs up everytime you get a fish is somewhat jarring, because he is standing on an invisible ground.
I think you have a winning contender.