One of the unsung and often forgotten champions of old-school dungeon crawlers has just been re-released on GOG. The Dark Heart of Uukrul, a party-based, fantasy-themed crawler that sports top-down combat reminiscent of the Goldbox games but with a strong focus on an intricate and well-developed dungeon with some rather good puzzles.
If you want to have a good overview of the game, you can head to CRPGAddicts review of it, for whom the game was a completely new discovery and which blew him away in a positive way. If you haven't played this and don't mind old games, definitely give this one a try.
If you want to read an interview with the developers, you can find one from 2012 on the RPGcodex where hardcore dungeon crawler Crooked Bee managed to ask Dark Heart of Uukrul's co-designers Ian Boswell and Martin Buis many, many questions.