It's great that you included a tutorial. It's a fun game idea, and the power-ups and upgrades really help keeping up the motivation. The only thing I would mention that dampened my enthusiasm a bit was the fact that you really couldn't tell when one of the faces would actually get you. If it was clearer when they actually would get you (like on actual contact), you'd have more knowledge about when to use an upgrade last second or not. Either way, very fun game!