Poison 8 - Slow 7 - Sniper 6 - Illuminator 5
First two wave I only built poisons, first 2 slow, sniper at the mid-bottom left and illuminator, and upgrade illuminator's range. No upgrade on snipers and slowing towers until last wave.Thanks! It worked! I only have illuminator level 3 so I had to change up the strategy a little.
3 stars - thanks Mesaclin!