I'd love to see this fleshed out - pirate games are awesome. I know you could take it far, too, because you made your own engine for this. That's a big investment to make, but if you keep working at this game, I bet it'll pay off. I also really like the art and fonts that you used.
It seems like you have a good idea of what would make a game like this fun. Maintaining a ship with cannons and fighting enemy pirates sounds awesome! That being said, there is not much here in terms of gameplay. I got my ship pretty far two times, but both times I fell off the ship because of the weird lack of friction, and I don't have the patience to run through it again and see what's past that point. Considering the fact that it takes a few minutes of walking back and forth to get there, you probably should have at least added an invisible barrier to the sides of the ship.
That aside, what I'm really interested in is where you take this from here. If you are going to keep developing this, I suggest making a social media account or mailing list so we can keep up-to-date on it. I certainly would.