Shoot down all enemy ships in each wave while evading their shots. Enemies have various behaviours and also drop some credits and boosters. Use credits to upgrade your ships.
"Take your Starship to fight! Cruise the Galaxy and shoot down formations of alien enemy fleets. Collect credits to upgrade your star fighter. Watch out for enemies shooting back and strong Bosses! Hordes of enemies can also be handled with various boosters at your disposal. Dodge the bullet hell and shoot 'em up!"