don't delete world, every time save please

add a device like a Time Machine
I want to feel memory and nostalgia

It is also possible to bring items to the present world
And you can leave time capsules in the future world.
and Haven and Hearth must evolve, industrial revolution, modern
I think in the future world, there is universe, there are running cars, there are hamburger shops, etc.

Agriculture will also be efficient, and you will be able to work efficiently using a vacuum car such as a tractor
plant factories can grow even in winter.