You have to stay on land, otherwise you will loose 500 points and will have to start the level again. Avoid the golden spheres, as they explode on impact with anything. You can push the boxes together to make a bridge or a path (only one box at a time), or push the box on top of the claws to open the Blue Vortex. Don't stay on the claws.
You have to control a silver ball called SilverSphere by using the arrow keys (left/right/up/down), and make your path to the Blue Vortex - the exit to the next level.