There may be a persistent world

It would be interesting for some or all of the world the player had built and discovered in a previous world survived when the player came back to a new game after losing. For them to stumble on a part of their last base and be able to reclaim it. This would be a similar to the concept of bones files from roguelikes.

Things are likely to have changed a little when the player finds their old haunts, though - the world is a shifting place.