Awesome game, got many Port Royale vibes. I can't imagine how many hours you put into this, as it is extensive and well designed and implemented. I can't wait to play the final version as many others as I see in the comments.
I honestly think that it can become a popular game if you just improve the UX (like adding some more tutorials), add the things that I suppose you couldn't due to the deadline (like some abilities, other minor gameplay features, some animations), and fix some bugs. My reports are some issues with the music, and the graphics loading a minute or so after the spawn. Nonetheless, my favourite entry so far. Congratulations!