Exactly what it sounds like. (Except for the aliens, I hope.) A little rough around the edges (probably could have used the snap-to-grid feature of Pfhorte a bit more), but playable-no major problems. I'd have to disagree with the difficulty rating listed in the readme-I had no trouble clearing the level on Normal, first time through, with plenty of ammo to spare. Kinda fun, though... all the big baddies are in big, wide-open rooms, giving you room to maneuver. I wish I had a teleporter in MY house!