coolio
yea it needs some upgrades or something else to make it different level to level besides just the arrangement of the cannons....also further into the game it seemed that even after I sunk the structure and all the cannons were blown up, cannon balls kept coming from the structure, even when it was under water, and even after the screen came up to say level complete. The cannon balls still hit the ship and affected the health to where it was drained and said you were jailed, but it still let you proceed to the next level. And on some levels it appeared cannon balls were coming from cannons off screen or just appearing randomly.