Move your Mouse to control the red dot, however, the red dot will not always go in the direction you want it to. For example, in the first few levels you need to move your Mouse Left and Right to go Up and Down. Collect all the stars to complete the level by moving your red dot into them, but avoid the spikes and other enemies.
Use your Mouse to move your red dot in the direction of the yellow stars so that you can collect them all. But, remember that you might have to move you Mouse in reverse directions to get to where you want to go.