BBS door games were one case of "anything goes" in terms of theme -- anything the author could describe and you could navigate through menu hot-keys was fair game. That said, I've got to say that this particular BBS appears to have a somewhat meagre spread. One thing's for sure -- they weren't selling out by laying out all the popular BBS doors all the other boards had. Star Trek Cryptograms? I suppose every niche has sub-niches.
Now for some bona fide blockbusters: first, a run of Earthworm Jim pics. EJ was the brainchild of Doug Ten Napel, a gifted animator who was responsible for making Virgin's Disney adaptations (Aladdin, the Jungle Book) blockbusters. Then he was brought on board by Playmates to devise a new line of action figures tied to some cross-media franchise: historically these things were cartoons first, then toys, but in this case they bucked the trend and debuted the characters in video games. As his follow-up, he used an enormous amount of clay to make The Neverhood -- a lost classic that's recently become supported by SCUMMVM. I was first introduced to him when his surname was used as a sound effect in an issue of Rob Schrab's comic book Scud the Disposable Assassin.