You must defend the earth against invading creatures coming from other worlds.
They have started to invade earth and destroy all human being. The last hope...: the new big canon: ALPHA DESTRUCTOR 1. A powerfull weapon that should destroy the invaders, and end that war... But this weapon is not finished yet.
You must protect ALPHA DESTRUCTOR 1 from the invaders

Instructions

Every unit has different characteristics and you have to play wisely to defeat your opponents. Make sure the enemies don’t reach ALPHA DESTRUCTOR 1, or this will be the end of human being…