It's been covered a bit in gaming news, but it definitely hasn't blown up yet.
My interest was piqued when someone called it "Falloutcraft" because it shares artistic similarities to Minecraft (blocky, endless exploration) and Fallout (futuristic open world with guns).
http://sites.google.com/site/3079game/.
Note that it's cheaper to get the whole http://www.indieroyale.com/ (which comes with 2 other games. 3 days left to purchase) than to buy the game directly from the site.
Some screenshots are on the main page.
I bought the bundle, but haven't played too much. I walked around and couldn't find out what to do just yet (find a military leader, it said.)