Are there any power-ups? Does it get much more difficult? The demo video didn't seem to show all that much in the way of gameplay, and the description is rather

Are there any power-ups? Does it get much more difficult? The demo video didn't seem to show all that much in the way of gameplay, and the description is rather spartan as well... Basically, why should I try this and not one of the myriad other Asteroids clones?