[ketzo]

Big +1 to both of those.

The Cypher System is probably closer to D&D, but the combat / rules / stats are a lot more streamlined, so in my experience it's easier to jump between narrative and action.

Monster of the Week is a bigger (and welcome!) departure from the traditional TTRPG formula, and is probably closer to what GP was looking for -- it's a very light "game" system on top of the players building a story together with the DM.