Fun game, really like the cutscene art, especially the final one with the two boats, very nice.
Its interesting to play a battleships style game where you don't get to place your boats, it really speeds up the gameplay and you can get into a nice rhythm against the AI when exchanging attacks. I think the powerups could have been a little more powerful and the square/L shaped ones could have done with an indicator of where exactly the shape would hit - a few times I wasted half my square attack by aiming incorrectly.
The fuel limits were a bit stingy - first time I played I managed to spend all my fuel before the first battle and had to restart. Then in my second go, I was scared to make one incorrect move on the way to the post-it coordinates incase I got stuck again.