I also wish that the movement was happening in real-time, because I think that it, combined with some animations, would make it more clear who is attacking what (sometimes nothing was happening on the board even though there were enemies standing before my barricades).
Anyways, the concept is really fun, and the unique art-style and ominous music make it stand out in my eyes. However, the controls need more fine-tuning, and especially cancelling the selections felt a little clunky. I feel like binding "back" to the RMB could do the trick. I also had the same problem as randomphantom whenever I tried to crush the enemies that got too close to right side of the window.
Nevertheless, you have accomplished something really cool and unique. Good job!