The 'A' button makes the pad move faster. There are a number of balls bouncing around the screen. There are also a number of stalactites growing from the top of the screen. If a stalactite touches you you'lll also explode. You move up in levels after a preset amout of time.
Higher levels have more balls on the screen.
You score points just by being alive, so the purpose of the game is to survive as long as possible. You only have one life.