The castle was just to easy to defend. You are given to much troops and the walls are way to thick and they woulden't be able to break through anyway since they are on a heigtened terrain.
As I said before way to easy to defend. I didn't even bother attacking because it would be impossible.
Your main keep design was pretty good. Also, the arena was a nice touch to. I guess your pretty good at designing castles so keep this up. You just have to improve on everything else...
Map Design: 2
The map design wasn't good at all. The waterfall that exited the castle also exited into the castle which made it very unrealistic.
Well, what can I say? You have no story, the only way I can tell you to improve on this is to write one next time.
This map is impossible to lose by defending, and impossible to win on attacking. Try to write a story next time and improve the balance and everything else.