Loving your game! Well done!
I have a idea which maybe will be in future as its a bit complicated. Im guessing you are working on underwater already? Anyways if you ever get to that it would be awesome to swim down deep in the ocean and spear fish while collecting items. I had an idea for a item you could find. So you could add large/medium sized clam shells which you could use to build a rain collector. Maybe you need a plank and a shell and then you mount it to your boat and if/when it rains you can collect water from it! Also another idea would be to add weather. And also add fishing nets which you cast in the water and wait a while then after you get 2 to 5 fish if you're lucky.