The Invasion of Terra

An alien spacecraft has invaded Earth. It has the power to bring the dead back to life. You are our only hope (I dont know why) to save us all. The UFO has landed within a coal mine (for some reason). You must destroy it and end this madness. Use the various items laying around to help you progress. There is a catch however, each item has a weight. If you are carrying a lot of heavy items, you wont be able to go very fast. So the more you have, the worse it gets...