Seems like a cool concept, but I can't get going. All you can make at the beginning is the level 1 mines, and there doesn't seem to be a way to get energy since the mines use up the energy you need to build the power plant.
I really like these kinds of resource managment/efficiency type games, so I'd really like to play it more if you get to start with more resources.
Also, I don't get to see all the underground space like the screenshots do, just a small layer.