I got as far as level 33. I purchased the support tower and it seems to have ruined everything. I go back to level 32, which I beat first go and I can’t beat it anymore. For level 33. I can’t even make it through the first round without a loss and I have fully upgraded gun towers. Before round 2 is over, I always have 6 lives lost. I have tried variations of tower placement but with the limited starting currency and even with the special to make enemies give more money purchased, I am still unable to win anymore. Difficulty just went off a cliff when I purchased the support tower. My guns do no damage to enemies. Even in levels I beat before without a problem.