This is great. Taking out the big screaming square takes a combo of preparedness and luck - really spicy stuff. I still didn't win but I got close, and I finally got the jerk back!
I really like the way the creatures look (and the overall presentation).
Possible refinements? A 'next' window a-la tetris, and maybe the ability to choose what order to process multiple encounters (or maybe showing some numbers so you know what the logic will do).