This is going to be horrible for my free time. Substructure sounds like a real interesting entry into the factory building automation genre. Coming from the developer of the popular Factorio mod Ultracube, now going by Dubious Design and publisher Hooded Horse. With vertical layers, it's set to add some interesting design choices.

More about it: "Set on a rogue planet that appears at the far reaches of the solar system, players will be tasked with leading an expedition to uncover the mysteries of this interstellar interloper. Establish complex automated factories and production chains on the lush surface of this alien world, all to support further exploration below the crust. Players can also work alone or with friends as they build around intricate caverns, and exploit alien resources hidden beneath the surface, driving the light of industrialization to the very depths. What mysteries will awaken and what dangerous threats will emerge remain to be seen…"