it's a very fun game and I love the idea, however it seems that defeating the pirates at the cities becomes too hard. I had 3 cogs and beat montego yet with 3 carracks i could not beat the next city. It seems that there should be a more linear leveling of enemies. This makes you have to do a bunch of trading before you can continue in order to get better ships.
Otherwise I love the music and the originality of it. The fighting is simple, but fun as is trading.