Thanks for playing! Looks like you explored very thoroughly! The game is incomplete at the moment, there are some areas and monsters missing, and there is no way to destroy the station yet - the difficulty level that requires that warns you that its not completable yet. There is going to be computer screens with a "you are here" display, and probably some sort of pause screen map as well. As for locked doors, you should be able to explode some open if you find the rocket launcher, though rockets are precious.