Just build your castle up - focus on bricks and builders - and steal as much as you can, while keep attacking with what you are given. If you focus on a direct attack strategy, you will fail every time. Good luck! tl;dr Easier to get your castle to 100 than get his to 0.
4/5 and a fab game for having been made so quickly. I would have liked to have kept playing *just* to fully upgrade my ship, and the scrolling when heading up (North) and down (South) are a little hokey. But otherwise great - thank you!