I'm not sure about immobility. That's not part of what I have in store for the game at the moment, and there's still quite a lot of things I want to do before I can consider the game complete. So for now, no immobility in sight. But eh, that might change someday.
Regarding NPCs, however, that's one of the next big things I want to work on, as that's what is going to give a lot of its "flavor" to the game. But it'll take a bit of time, and I'll most probably add functionalities related to NPCs bit by bit. And once I'm happy with how the NPCs and events system works, I'll work on generating NPCs based on your save files, so you can make your characters interact with each other.