Fun to level 50+!
I beat level 50, then decided to call it quits. I had gotten to the point where all I had to do was start it and watch the guys blow up. Almost nobody got past the halfway point. You should have made it harder. Also, I found some bugs: At like level 20, the "Airstrike" meter froze so I had to guess when my airstrike was ready. Also, sometimes enimies walked right through my base and couldn't be killed. They didn't do any damage, but it was a little annoying. Otherwise, perfect!
End Stats:
Maxed out barricades/weapons
200 Tower Guards
100 Repair Guys
75 Com Hub Employees
Kills: 7310