Press T to spawn a spike shooter that auto-shoots for free Press C to spawn a crossbow for 25 points (It aims at your mouse) Press A to summon airstrike for 50 points. (It may disable other towers) Balloons come out faster and faster. Put your towers down to survive. You can't put it on the path. Aim for the highest point total! Upgrades are important.
For the airstrike, press A once to aim, press again to confirm. Unfortunately, clone limit may disable towers because scratch sucks. :( Not mobile friendly sorry. :( THANK YOU NINJA KIWI FOR IDEA!!!