The greatness of this game comes from being able to control the ball by tilting your phone. The aim is to not be squashed against the top of the screen by falling through the gaps. There's no power up or anything, the only thing that changes is the speed at which the bars rise. And I have played this game so much that I find the last stage (the highest speed) too easy - I can essentially play indefinitely. Even though it's already a great game, more content should be added. I highly recommend downloading this game, it's tons of fun and it doesn't take even a second to figure out how to play. Here's a tip for playing: turn up the sensitivity to full. It allows you to play better.