So you need a reason to buy a Vita? You have one now....
Gets good about 45 seconds in, don't dismiss it before that. I mean, you really can't deny the innovative nature of this game. Like the style of game or not, this is clearly unique and something you'd expect from Nintendo. Now, the only question is - will all that we see in the video work as flawlessly as they make it out to be? Screen tilting is great, if it works immediately.
If so - that game could save the Vita and more importantly, display what the Vita can do to other devs who can take advantages of those features seen there. Not a game for everyone, but it could spark an interest on a system that I really want to like and buy - just waiting for games.