I absolutely loved this game as a child. You can create your own species, vehicles, aircrafts... and conquer the Milky Way with it. Gameplay could be better because you can create a lot and do a little.
The atmosphere is surprisingly good. This game feels like a nightmarish dream and makes you think that there is someone behind every corner. But, levels lack variety and they look almost identical. Also, the story is not sufficiently covered. It's not mysterious, it just lacks something.