Personally, I'd like to see the store take this direction. Either the player builds enough to contact Earth, and Earth says "We're trying to get to you, but in the mean-time, we need you to build a base with the following to support the people coming in the rescue ship." or have the player not able to communicate with Earth, but happen upon an AI Computer which refuses to allow the player to call for help until things are proven safe for human habitation, as part of which, the player must build a base with certain conditions to support humans once they are allowed to return. The player could then build the base with as little as needed to fulfill the conditions, or as elaborate as possible, and then be allowed to be rescued. Upon rescue, the player can either choose to return to Earth as a hero, or to remain on Mars and be the new caretaker of the base, or perhaps be free to live on Mars as they choose as a reward for their heroics for the rest of their days. Perhaps in their freedom, they might make a small base settlement and recruit a small handful of people to live with them under their care. In either case, a possibility of an open-ending like this is really important in an open-world game these days, because often the player becomes really attached to the world they establish, and don't want the experience to end just because they completed the story. Thanks for your time, and I hope this feedback helps you consider what the story in the game could be.
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