This would be so much fun as a multiplayer game! I enjoyed the combat - would have been nice to have a UI with some idea of enemy health. I wasn't able to sink a ship. I was able to hide in a castle ;)
Wow, yeah, I nearly did make it multiplayer, I still want to, I'm continuing to develop this game, it's fun and has a lot of potential. As Mitrigno suggested, waves of enemies to defeat is something I'm keen to add as well. When the jam is over I will have an updated version to play