Ah yes, gaps between the 'fortresses' = defense /s
I still don't know how they plan to defend (well) against ground attacks. The Fortresses are literal walls with gaps inbetween them so that the supportive buildings are not protected. I will just ignore the Forrest by assuming that the illustrator just placed some of his patterns there to make it not look boring. Gaps between walls only make sense in Tower defense Games for streamlining the enemy but i doubt their enemies would react that way.
Btw sick Coat. He should totaly keep that one.