The game is currently in pre-release alpha form on the website, and you can pre-order the game for 9.95 Euro (about $12), which I did. I know that whenever this game is released, I'm going to love it, but more instantly gratifying is the fact that by pre-ordering you get access to the latest and greatest development mode he's got going, which is clipping along on its way to beta-testing phase. There's a crafting system, and increasingly complex tool system that requires you to build up your base and gain access to resources of varying sorts, a dynamic lighting system, and other cool things like doors, ladders, and other things to help you build a better zombie-proof base.
Oh, that's right, I almost forgot. It has zombies. The whole point of all the work you do to build a base and create defenses is so that you can survive monster attacks. Monsters only spawn in the dark, which means generally only underground and at night, and zombies and skeletons burst into flames when the sun hits them, so you find yourself with a scenario where you need to build defensive fortifications to survive day to day and night to night with unrelenting waves of baddies out for your flesh, all in a sandbox world where you build your own walls, shovels, pickaxes, swords, armor, and everything else. You can farm, raise animals, mine, and generally be exactly as sedentary or nomadic as you feel like.
Yeah, this game is going to be awesome. And it isn't even in beta yet.