During the first global biochemical war, a powerful new form of retrovirus was released from the enemy. The viruses unleashed biological forces which couldn't be stopped, leaving the planet filled with deadly forms of life.
The player can move, shoot, dodge, and block. To block an enemy projectile, the player must place the power star in the path of the projectile. There is also an array of different weapons at the ships' disposal.
You have a choice between four types of ships: They include the bird-like blue and red ship Orestes, the reptile-like red and green ship Electra, the bug-like green ship, and the fish-like yellow and purple ship. These ships all have organic shells, making them look like actual creatures.