The adventure is written in such a way that it is very much a system-agnostic adventure. The only place this becomes an issue is with two of the possible creatures encounters that I cannot think of a major publisher equivalent (however, if you pay this adventure with Swords & Wizardry my Grate Tentacles* will be of use). The map is small and simply done in the black and white style common to a certain point in the hobby's history.
Depending on the Game Master this encounter location can provide an interesting evening for a group of adventurers between missions.
* Grate Tentacles can also be found as one of 47 new creatures for Swords & Wizardry in The Cartographer's Guide to the Creatures of Eira.