I was looking at it in the steam sale, really tempted
Really interested in it myself.
It's supposed to be coming out on iOS soon too... I kind of see this as an excellent iPad game... which is why I've held off buying it on PC.
As usual, TotalBiscuit gives a pretty good demonstration of it in his video:
It is really very good if you like that sort of thing, It is a simple but very effective game.
Never played anything like it so no idea if it is my type of game.