Use your space fighter (S.F.77) to destroy enemy spaceships and collect energy from them. Use that to upgrade you speed, weapons, or improve shields which will allow you to survive even harder attack waves.
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Double Shots38.8%
Upgrade your weapon to shoot two projectiles at a time.
Three Shots31.6%
Upgrade your weapon to shoot three projectiles at a time
Speed Upgrade 138.9%
Upgrade your spaceship speed to level 1
Speed Upgrade 233.5%
Upgrade your spaceship speed to level 2
Speed Upgrade 330.6%
Upgrade your spaceship speed to level 3
Speed Upgrade 429.3%
Upgrade your spaceship speed to level 4
Speed Upgrade 528.7%
Upgrade your spaceship speed to level 5
Four Shots29.3%
Upgrade your weapon to shoot four projectiles at a time