It's up to you to defend your planet from the intergalactic bully that seeks to destroy it. As he comes floating over your planet, draw your weapon and aim. In each level, your enemy has arrived with a load of gravity bombs he intends to drop. Save yourself and your fellow extraterrestrials by making the bombs explode while they're still high above you. Your gun shoots gravity bombs of various colors, just like the bombs that threaten you. Aim your own bombs at the enemy's bombs of the same color to blow them up and earn points. Earn enough points to make your enemy retreat and leave you safe – at least until the next level.