In this side-scrolling shooter, it's up to you to destroy the enemy by making use of the four familiars that fly in formation around your vessel. Quickly switch the formation pattern of your familiars with the touch of a button. When you destroy an enemy, its soul becomes available to collect. Collect the soul with one of your familiars to upgrade its attack or switch to a different attack type. The familiar's attack can be upgraded by collecting multiple souls of the same color in a row. The four familiars power up and change independently of each other, adding an element of strategy as you plan how to use each one effectively.