Improve your weapon, and stop the invasion, General! But beware Green Ghost, as it steals your bombs!
Collect bonuses to improve your weapon before The Invasion culminates.
Beware of Green Ghost, as it steals your bombs!
Throttle with Space, click or a simple touch. Pause and continue with P.
Also on Android: https://play.google.com/store/apps/details?id=com.featuresque.greenghost