I've read the comments below a bit. And (sorry if I spam here a little) I don't agree that boats are the weakest pieces. They are mostly a great alternative pick for me. Also, in my opinion waves are the weakest. They are rather difficult to handle and they are always set to 2 points only (which is why I like to set them next to islands for house bonuses)
I think there should be an option wether I want to make a third island or not. Because most of my games are made with 2 filled islands and a third 1x1 small empty island or I use the third island to cover a forced misplacement. And the only effect that a forced third island has is an unlikely scenario in which this third island takes away like maximum 2 points of boats. (again, this was my experience)
Other than that I totally like this game! Im playing it daily now haha.. I tried it once and it got me immediatly.
So I noticed that glitching, especially between the stones, could become a problem. Even if I have not found any glitches that give advantage, I would recommend to add temporary squares that shows the unpassable area in the game during the tests. I know Game Jams give a very short time for fixing minor things like glitches and I do not even know if the mechanics allow those squares for debugging but I think they could help. Just a tip if you want to create a similar game in the future or want to continue this project. :)
Good pixel art and gameplay. Could imagine this to become bigger and longer. In my opinion there is potention. P.S. I figured out that you can fall of if you move to the left at the beginning.
