Once I upgraded magic beyond a certain point on many of the maps I could just create a mob of 12 goblins and keep enough of them alive with magic to raze the city.
The camera moves around too much when you're trying to use the cannon, it makes it really difficult to aim the cannon. If you're following a missile/cannon ball clicking the mouse should bring you back to the launcher without firing, as it is it makes it difficult if you need to take multiple shots.
ATTENTION! If your score isn't showing up at all despite you checking the instructions and banging your head against the wall several dozen times, check the color of the text in the text box. Even if it's a color that SHOULD show up, look at Alpha. Is it 0%? This is why it's invisible, alpha is the transparency. I don't know why, but the default value of alpha for me is 0%, which means it's invisible, set it to 100% and your problem will be solved. Hope this helps someone else.
What would be cool is if after you beat the final stage you could share your created guns and ships with other Kong users. Like people can try out each other's ships in Free Play
If you make a gun in the shape of a square you can easily plot out what the bullets will look like when you fire them. I'm flying a penis-shaped spaceship that shoots penises! 5/5