Very nice
Nicely done, very professional. Good graphics and smooth gameplay. One thing that ticked me off was that both shots arrived at the target at the same time. Often I'd try to shoot a bomb that was right next to the left cannon. The shot from the left cannon slows down to wait for the right cannon, which got kind of annoying. It would be better if you could fire each cannon individually (ex: fire using the keyboard), or if it automatically fired only the cannon that was closest.
Other than that, very nice game.