Come across a major bug.
I liked the gameplay, was pretty hard to get the right strategy to survive (I abused mages, they work SO well)... but when you get to about level 6, the game suddenly becomes incapable of controlling the enemies and the image on screen comes to a halt, while the gameplay behind the image still actually plays. I'm stuck with a screen FULL of horsemen I've killed and can't see what the enemies are doing.