Each ship has different characteristics based on weapon strength, speed and the power of the special weapon, a depletable super weapon different for each ship. The most important difference between the ships is the shooting pattern; some only shoot in straight vertical lines, while others have bullets swirl to the sides. For the first ship Particle Bird for instance, there are two keys: one directs bullets to the left, the other to the right, and when pressed together they form a straight, vertical stream.
While playing defeated enemies leave behind weapon upgrades that also act as the main energy source. When hit, some of the upgrades are lost, until the ship is entirely destroyed. Other collectibles are score multipliers. Not all special weapons are offensive, one ship for instance is also able to generate a temporary shield to block incoming attacks. The game contains a global ranking and a list of achievements.