Those bows are really over powered. It takes like 2-3 seconds to pull it back fully, and when you do, it doesn't have gravity and it kills in one shot.
At least make it slower to charge it or something.
Edit: You also cannot shoot people if they are in the boats, even though they are clearly not being protected by anything. Not sure if you can do anything about that though.
Other than that, I would suggest adding actual terrain to the islands, instead of just being flat.