This is a traditional top-down shooter. The player controls a microscopic ship that is tasked with destroying an onslaught of parasites. Once the player destroys a certain number of parasites, they must then destroy a "guardian". After destroying this creature, the player's ship grows in size and all the earlier enemies appear smaller. Features of the previous level that functioned as walls and other obstructions now reveal themselves to be new enemies that are no longer gigantic due to your growth.
This game is only available for single-player. The basic Arcade Mode unlocks other modes after beating a certain number of levels. Bonus Modes: Guardian Rush (boss mode), Survival, Defender (no offensive weapons), and Overkill (unlimited smart bombs).