Click anywhere to launch ball. Direction and speed of the ball can be changed by moving the mouse. Be careful! Hit in objects with red tint will take away points. Flashing objects add and take away x 2 points.
Almost in every level of the game you can find hidden objects, which give opportunity to get bonus. Hit in the star gives 5 homing balls that fly wherever indicates sight.
Each collision of a meteorite with a planet takes away points. Hit meteorite to avoid the collision.

Don't forget about hotkeys!

Walkthrough video:
http://www.youtube.com/wa tch?v=qdYKdzp-GQw