This game was really fun, though I was not great at it. I'd always die trying to get the canons facing the way I wanted. I really loved the shark design. A lower difficulty at the beginning before ramping up would have been good for me, but I also might just be unskilled. I could see it being addicting getting more and more canons. Great work!
Edit: It was much easier when I started using the upgrade spaces. I wasn't sure what those were before, but it was my fault for not reading.