Astrum is very simple, you are using only one button. On the press of that button you will stop rotating and move the way the arrow is pointing. The goal is to get as many points as possible by collecting yellow stars. For more games play Bowmaster Prelude, Sonic the Hedgehog, and Shift 3. To collect all of the yellow stars you must click your Mouse at the precise time, thus launching you in the direction of the stars that you want to collect.