zwol | text adventure, almost forgotten

[I played a text adventure back in the 1980s. I had a damaged copy, so the room descriptions stopped about halfway through; somehow I made it to the end by guessing commands possible in any given location. I'd like to try to find a good copy, but I can't remember the name anymore. All I can remember is:

It started on a spaceship, which was leaking, and eventually crashed on a planet.
The rest of the game was wandering around trying to find a working ship so you could get home.
In the process you collected alien artifacts, which determined your score at the end.
Fairly early on it started saying "You feel a localized discomfort". If you did not deduce that it wanted you to issue the command PISS, you would shortly die of an exploded bladder.
At one point you were captured by a beautiful princess, and could only escape by summoning a monster to eat her.

Anyone have any idea which game this was?