The last rounds where really lagging. One frame every few seconds. I was standing in the middle and let my maze do the job. Eventually one of the 16 queens summoned a unit in the middle as their shadows ignore walls. I saw it in one frame and was dead on the next one.
I added some tweaks that i didn't mention in my strategy (too keep the highscore). If you want to go further than that you need some serious juking, which i am already thinking about ;)