Hi all!
I play some hours with this game, but I can't get it how I remove some buildings.
I have a mill before the new area, but now I can't past that.
Also, if I push the escape or E and click on 'system' nothing happend and can't save it.
Are this some bugs? and how can I play further now.

There's no option to save in demo 6 as far as I've been able to tell. Though it does autosave on exit. To get rid of a building queue up some task for the building. That'll allow you to tear it down with your pick.

Okay thank you.

There are no tasks on a furnace or mill, so I can't delete it.