For all of the main levels, the goal is simple. Use the controller to fly and fire at the shield surrounding the alien cannon. Once a path is blown away through the shield, you actually need to fly your ship OVER TOP of the enemy in order to collect the exotic particles used to arm your cannon! Once charged, back off and fire!

Boss levels are different and require you to aim at weak points on the enemy ships. These weak points will be marked with a beacon. Fire until it gets you or you get it!