The goal is to to beat the high score. Gadgets will help you with that.
You control the ball by dragging across the screen and then releasing. This gives your ball a boost in the indicated direction. If you die in the first world, dont worry, you have a backup in a second world and can further increase your score there. But be careful, if you die here its over. Only collecting a heart brings you back to the first world. So download and start to Drag the Ball.
Tip: First of all, test which items cause you to die and which ones give you an advantage.