No over view, no explanation, no nothing! You begin with something, a creature of some kind,nut that kills you immediately. After 2 or 3 deaths you figure out you must dodge whatever it is these things are shooting. Kill them and you can pass to the next room of death. To the developers: What were you thinking? It's SO simple we should have no problem? I'm curious, wonder how many people play this game every day. Because I have games I play daily.