A great game!
Graphics: 10/10
Grayscale graphics that look great on the calc. And this does not slow them down either. The ball sprite moves fast (sometimes too fast), and looks awesome.
Controls: 9/10
Great and interesting controls. It feels like you are pushing a ball over ice when you play this game. It also uses pressure-sensitive controls, so you will sometimes hold the button, and sometimes touch it as soft as you can. The only complaint I have about this is that sometimes it is a little too sensitive and you go skidding off of the edge
Attention Span: 8/10
Great, but needs more levels. There are a ton of levels in this game, but they are all really short. You can beat it easily in one sitting, but you'll want to play it again. Time I had it on my calc: 1 month.
Overall: 9/10
One of the best games out there, hands down. If the controls were tweaked just a bit and external levels were made, this would be a perfect 10.