Wow, it's finally here! I actually just noticed this was available, pretty much as of the time of writing this review, but bought it instantaneously. I was one of those who would write letters, asking for this game to be listed on GOG; so very many thanks to those (Scott Greig, et al) who made it happen.
I was in college (Syracuse University) when this was released. I recall seeing it within a store, and though I bought it immediately, I almost wished I hadn't, as I played it for far too long instead of going to classes, and boy, did my grades suffer!
Anyhow, I have just played it for an hour and am looking forward to many more.
True, this may not be the most enjoyable game for those who are new to it, but in the vein of great old games, this is an absolute classic and one of those which will be greatly welcomed and revered by those who knew it then.
I can't wait to play more and encounter a creature(s) I think were called "Gortunkleers" and to cast spells to make sealed doors swell with resistance, but then perhaps open...