I gave it a shot.
Bugs
* Black screen when clicking "new game", quitting to the menu, and clicking "load game"
Feedback
After playing around with it a bit, I can only say that I am confused.
The controls are weird. For example, why would you need to rotate the view if it's so limited? That should be extended to 360° freedom.
I had no idea how to remove voxels or place them, is that possible in this version?
The barriers didn't really help, because the miners just dug underneath them. Barriers should probably have more depth, or at least have a brush that supports more depth.
I didn't understand barrier placement. I didn't have a "continuous" brush as I expected it to be, the barriers were just placed at random. Is there a button which places them?
TheComet