What a cool galleon (it is one, right?)
One request: please add the controls to the game page! It took me a couple of minutes to figure out that I had to move with WASD (not arrows) and shoot with Q and E. At first I thought your game was broken!
The shooting direction also confused me a bit. Maybe a small HUD indicator showing Q and E on each side of the ship would help.
Apart from that, the art is cool and the game loop is fun, even if simple. Nice work!