It is later more commonly known (even in Microbee adverts) as Underworld of Kyn.
The (1983) C64 version was sold by Ozi Soft (as well as being distributed by High Technology).
Author, Andrew Farrell later became the editor of Australian Commodore and Amiga Review (as confirmed in volume 8 issue 11).
[+] Users who have solved this game
[+] Users currently playing this game
This game gets my recommendation for the "Worst Font Ever Used In A Text Adventure" competition should it ever be launched.