TL;DR
I'd like to suggest the implementation of shields. These have the same function as walls, but consists (and need) only energy.What ?
I suggest the implementation of a shield system for walls or greater areas. These systems could strengthen the defense of every factory a lot more, but at high energy costs.The images below show, what I mean. and In the images you see a 1x1 shield generator (full orange) creating a shield barrier 3 spaces away with a length of 5 spaces. So this generator might be placed behind walls or buildings to create and additional defense.
The curved shield is for the edges and looks better, than the sharp 90° angle you could realize with two normal barriers.
Why ?
Mainly because you already have a personal shield for the armor integrated in the game. Where is the point not to maximize the output and use as a base defense?Best wishes,
NeXuS