FortressCraft : Chapter 1 Anniversary Edition is the PC-update to the world's first and best Creative-focussed Voxel block builder.
So everything is done, working (if not perfect) and I've been doing nightly streams on the development for your aghast viewing pleasure. Right now the game is with Valve - if they approve it, it goes live. If not, well, then I need to fix whatever they come up with and resubmit. Exciting!