The main goal of this game is to defeat waves of incoming enemies using the abilities provided. The element chosen at the start determines the initial attack and the direction of upgrades for future abilities. Enemies may drop crystals upon defeat. Collected crystals fill the experience bar. When the bar is full, you level up, allowing you to either choose a new ability or upgrade an existing one. Anvils dropped by bosses can be used to enhance max-level abilities and increase your power.