Neat game. I enjoyed playing it through to completion. Fighting pirates was fun, the squid completely destroyed me (but I got my own back eventually). The fishing/crane injects some variety into the gameplay.
Good choice of tone/palette. I liked the little animations such as when you rescue Alice and they spin around.
For improvements, maybe add the velocity of the ships to where the Cannon is firing at. Also, it would be funny if the Squid and the Pirates could start fighting each other sometimes, rather than teaming up on you.
Well done!