This is a super ambitious game, really huge scope! I was able to find 1 island (in sector c4, named after my itch username), but unfortunately I didn't have the patience to continue; sailing was too slow for my taste. I know this is meant to be a cooperative game, and kudos on doing that, but it would've been good if the ship moved faster, or if the map was much smaller, as I thought it felt too expansive.
Still, the concept is really neat, and I think this could be interesting at a smaller scale. Good job!