According to your game guide I am allowed to build barricades. I'm third place on the score board as of right now and have yet to build a barricade. Barricades would be fucking awesome. I never saw anything about them in the in-game tutorial and then all of a sudden on wave twenty or thirty I see an in-game tip " don't forget to build barricades" or whatever the fuck it said. Thats my first bitch, the second is that when I command a unit to go heal himself he will stop at the healing station, turn around, and engage the enemy if they are in range. So...how do we build barricades?