Was fun and I won but I wish I knew how many waves it was. Aside from that my biggest difficulty was that I couldn't zoom out and see the whole board at once. I kept having to pan around after every turn to see if some archer crept in at a corner.
I'm also often confused about the wording of percentages. When it says "increases by 40%" I'm not sure whether that means 40% more than the current level or that it increases to 40% more than the original.