Defense Pyramid - You control it or does it control you?
This is one of many Defense Pyramids I've created. This newest one is from the latest 1.3 update. It's got some room for growth and I will update it as I build more defense mechanisms.
Here's a vague video on some of it's options, I'll be updating that soon: https://www.youtube.com/watch?v=UD_NDRPD3CE