Of course it falls in the same sandbox realm as Minecraft, but it looks beautiful and it's not limited to such a hard grid as Minecraft and so many other voxel sandbox games are.
It's just an upgraded Minesweeper, but it's got some great ideas and the presentation is awesome. Believe it or not I actually dig minesweeper so I might just buy this when it comes out. Or even now, they're doing a bundle deal on Groupees.com apparently (alongside my game):