I honestly have no idea what to name this because the idea itself is...hard to explain.
(note: I'm an old player who hasn't touched the game in some time, but I am fairly certain of my assumptions, if they are wrong then I will be thankful to anyone who corrects me).
So, I got to thinking "Why don't we have mine dungeons" and then I began to wonder about farms, and then grandmas, and cursors.
So, if my memory serves me well: dungeons start with factories.
But what if we started after getting X number of grandmas and they were basically the shop keep from normal RPGs...kind of? Tavern keep? Something, nothing, heck I don't know. But getting X number of grandmas unlocks them as your primary quest givers and item vendors.
Then getting X farms unlocks the farm dungeon where you fight stuff similar to the slimes in normal RPGs, then you get X mines and you unlock that dungeon group, and then the typical dungeon system.
I don't know, I'm just throwing out a random idea :/