Great job with this game! It was a good idea to have the coin spawner along with the fish spawner as it did take me a while to gather enough fish to purchase the boat. I think maybe reducing the price of the boat or increasing the sale price of the fish would help get into the fishing aspect faster.
It was a little hard to see the control commands against the sand but after moving the camera around they were easy to read. The UI and sound design were great and I like that each island had a lot to explore. I think a map with all the vendors would be useful as I did get lost the first time. I would have liked a proper fishing mechanic as it felt a bit underwhelming to get the boat only to have to pick up fish in the same way.
I can see where you were going with this and hope you continue to add to it as I think it would make for a very nice game with a bit more work!