So I've been chasing the dungeon flame and the PQI flag, trying to snag a new badge or class icon each time. It's fun, but what I would really like is some kind of indicator of overall progress. Here are some ideas, starting from "kind of reasonable sounding if you don't know anything about coding" and ranging down to "might get implemented if the devs get stuck in some kind of Misery-style kidnapping scenario."
1) A simple meter: Kind of bland, but it'd be nice to know what my overall percentage is without having to tab through every dungeon.
2) Kingdom decorations: After every dungeon's worth of completion or so, the player is given some kind of garnishment for their kingdom. Like, maybe you get a statue in the town square that gets bigger and more impressive as the game goes on. Alternatively. completion thresholds unlock items from a list decorations, allowing the player to play paper-doll with his kingdom, if he is into that sort of thing.
3) Special New Game+ Style Mode: After getting 100% in a dungeon, a special mode becomes unlocked for that dungeon only. In this special just-for-fun mode, the player cannot earn gold, but is allowed to choose which altars spawn and maybe have limited control over what is in the shops. The idea is after having demonstrated total mastery over a given board, the player can now use it as a sort of playground/test lab. It'd be a lot of fun to test and develop strategies for rare combos without having to scum a billion times just to even find out if they are viable or not. It would also make demonstration runs for specific gods and items a lot easier.