guicole, you have to click and drag the cannon to launch a bomb.
the game runs smooth here (chrome) and the mouse its cool, but i have to say that put links under the screen its bad because of the mouse selection function.
a time choose for the bomb would be great too and the boat moving to simulate waves could break the static feel of the background.
if you dont want to make a tutorial (something that i hate too) you should put a mark or something behind the cannon, like, "pull" or "click and drag", for people figure out faster what they have to do for launch the bomb.
great job, i hope i'v helped