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I recall that one of the earlier Donsol editions had something like "levels."  By successfully playing through a deck of dungeon rooms the deck was reshuffled and the difficulty increased by +1 ATK for every enemy, but buffing the player with +1 HP.  It let the player feel like they'd advanced a little bit after completing a deck, and although the challenge was still all RNG, it was always nice to get a few rooms through the tougher level.  I'd be entertained to see that mechanic added to the Assembly/NES version if you had the time and inclination or if it felt worthwhile to anyone else.