In your later games can you PLEASE get rid of the wait to view the castle. We know what it looks like, we don't need to see every single time you mess up.
I quick hint:When getting chased after the human zombies, shoot it in the legs so it falls and then forces itself to crawl. I found it very effective. + to keep this comment alive.
I also think the Archmages' Teleport chances are majorly unfair. In the .5:99.5 ratio it is almost impossible to teleport the enemy back. I think the chances should be made up to at least 5%.
This is an unusually awe-filled Tower Defense-type game. Instead of small tanks and only one selection you have many choices to choose from. This game has a good back-up to decide what type of soldiers you will seem to use most which I find stupendous. The only problem I find wrong with this game is the fact that you can't get rid of unliked soldiers.