Every so often a boss turns up, usually with three different stages of destruction to battle through before it is dispatched. The action never lets up as the ballet of enemies and their bullets once again resumes with you, the star, caught in the middle of it all. Fortunately, the intensities can be alleviated somewhat with the [C] key, which provides temporary relief in the form of a shield, provided you have some in stock. The [X] key not only provides sweet bullet respite in its main form as a spray of electric enemy disabling bombs, but as a multifaceted tool for organizing pick-ups.
By launching the [X] bombs into the pick-ups, they change in a sequence through life>shield>vanish>force and back again. In order, "life" increases your health, or 200 points if your health is already full. "Shield" gives you another stock of shield (mentioned above and deployable with the [C] key) or 200 points if that stock is full. "Vanish" is the most immediately useful as it clears the screen of any bullets. And "force" temporarily increases your attack power. Another, "Extend" is only available at the end of a level and gives you the ability to hold more health. Playing with all these rules in mind not only deepens the gameplay, but adds another layer of strategy. Quite an achievement for a fast paced flash shmup.