Thank you so much! 13th place is amazing, and with a high score as well! It took me a lot of tries to beat it. The game gets really chaotic really fast. My strategy is to only attack when necessary since it's really risky. Usually, I wait until I find a force field, then try to kill as many zombies and cockroach as possible. Also, I stick close to a wall, but not too close, to avoid getting trapped by the cockroachs.