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.