I know that was the plan, but the end result is quite different!
I know, but I can't stop comparing it to Moria/Angband.
I know the timing changes everything (and Nethack is more like a text adventure lore made into a top-down RPG), but the environment and tasks ingame aren't so that different both in Diablo and Moria.
If any, Flare RPG has anything the first Diablo offers with a longish campaign and a good set of skills.