After several attempts I was able to get this game to work, for some reason after clicking the instructions menu it makes it impossible for me to click "Play" and start the game.
After switching browsers I got the game to run, where the game was alright. I could move around, switch cannons and fight the ships until I blew up. Unfortunately though, I couldn't get the game to start again afterwards.
I have no clue what is causing these problems, but fixing the menu will make it so people will get a chance to play and enjoy it.
Other than that, the game just needs some polish. Making the menu a bit more lively and perhaps level selection or difficulties could certainly help. As well you could adjust the enemy A.I so they sail in different ways as opposed to always heading directly in a straight line to your ship to try and ram you.
All of that would help to make things more enjoyable.
So I wish you luck, and hope that an upgraded project will result from this. :)