It would be awesome if you could travel throughout the city below the tower. For example the could be another bounty slot so that you could do side quests for citizens or stop small fleets of fallen that invade the city. Or make new areas on each planet. Such as a forest on earth, more colony's on the moon, more of the destroyed city to Venus, and Olympus Mons onto Mars.
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Yeah being able the board one of those cargo ships that dock in front and go down, to the city.
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yes this would be awesome!