great effort :) Wave 10 is a monster! I find that I only place towers as I need to in the rounds to collect as much money as I can. I only place a new turret if a zombie breaks through. Then I tend to balance my upgrades mainly on speed and damage, however, I get enough range so that if you see the middle 2 rows that the back row of towers has enough reach to attack with the front row of towers......if that makes sense. but yes Wave 10 is pretty hard.