Now that players can have their “home planet” and as meteorite are an interesting way to put a random attack in a “blank” field on upper level planets, could It be interesting to include in the game some planets with alien civilisations ?
First it could be an opened way to include some quest in the game with NPC and populate a little the planets.
Then those aliens could be bellicist and could attack cities with a percentage equal to the size of the city on a planet. = You are big and prestigious … so those attackers think so.
If a defend is lost : those aliens would take all the money income of a city for a time. (hey you are big so you DO NOT NEED to become bigger … and that give a chance to others to growth)
If it is won players participating would have some bonus. (meaning that as viceroy / big colony / city you need to be friend with people around you)
they could eventually destroy some buildings (soft destruction meaning that no cube are destroyed but they become inactives and it simply can be repaired with the key tool… but as long as it is not repaired it’s value is reduced to 0… meaning that the city could eventually have less chance to be attacked again)
Those aliens could also organise battlegrounds (player helping them against player attacking for revenge) , battle in arena (Win some food / potion / money special and rare items after a battle against another player / mobs)
… and even have new technology that could be learned… to make new items / ship / tools/ vehicules…