i dont like the fact that every defensive building like towers do damage to plot next to the city.in real life the plot next to the city is a long distance.
my suggestion is this
for defencive buildings like mines or tower when someone attacks the city there is a chance that the unit will "trigger" the mines and get a semi random damage(minimum and maximum dmg based on building and unit power)
my suggestion is this
for defencive buildings like mines or tower when someone attacks the city there is a chance that the unit will "trigger" the mines and get a semi random damage(minimum and maximum dmg based on building and unit power)