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Looking at the kingdom idea, in pk the fact that kingdom size was limited by members bothered me. I think that the Empires on MYE should have tiers that you upgrade through adding more buildings, size limit, building levels, etc.
Also some ideas for more structures vould be the ability to build actual walls which would allow members of that Empire to atk/walk through while blocking enemies from doing so.
You could also add in a mercenary feature where the empire could hire AI controlled minions who would garrison in towers (or barracks until deployed) to help defend. But of course said mercenaries will have an upkeep you have to pay.