This feels like most Single Player Survival Games... you build a huge cool city that you're very proud of, but you can't share it with anyone or even show it to anyone because you're all alone.
He doesn't give a **** about the survivors, obviously, he doesn't trust them (or maybe he doesn't really care...)
So he must build his base first before he interacts with them...
Nice move for the mc.
He is sure a blackhearted MC. corrupting mom, scamming potential waifu and now avoiding becoming a savior, I like it. I just hope that he can makes some experiments on how to move the erath-side entrance. Maybe rig a device that can move to a new place or make a device to expand the entrance.