I have learned a lot on this forum and am now at level 23 correcting my mistakes. I have a couple questions:
1. I recently had someone attack my gun implacements. They caused a bit of damage. Why would they attack these guns? Can you earn money by attacking guns? Since some damage was done to my guns and repaired, can attackers actually destroy my guns and what happens if they are.
2 I noticed on the expansion level there is a concrete factory that reduces your time and cost of construction and upgrades. Is this worth getting? How significant is the time and money savings?