Very nice game! At first I thought it might be a bit simple, but that definitely didn't matter. As many other commenters said, there is a bit of an issue with understanding what is happening at first. But when it clicks it's very enjoyable and addictive game. The movement of the fish is really cool. One small design issue I'd personally consider is that those big ships are actually the easiest to defeat. They have only 2 big circling spots aroung them and nothing on the boat itself which makes it so the player takes no risk actually destroying them. It is a bit slower than the small boats but it's almost impossible to lose anybody there, so that may require some small changes. Other than that though, great game and a solid entry, congrats!