@tyrantbane - two mini gun towers in the first two slots and one laser tower. Upgrade the bottom minigun tower to lvl 3 squid and then the laser tower to lvl3
I can't beat 20. I get the bridge working fine some times (1/2 the time it stays standing/half it doesn't). It seems that if I do anything at the top part, it changes the entire map and different parts of the bridge will break at different times. Not very stable. Is this fixed physics/friction? Or is random? 4/5