Thanks for the reply! Yep, those are all pretty good ideas, and also almost all ones I'd considered during the jam, but ran out of time (or decided it was "better" to not have a reroll ^_^). Originally I was going to have a "wild" die you unlocked halfway through the game, or just add more than 2 dice at some point... but, well, didn't quite get around to it =).
Let me just express a concern about procedurally generated dungeons. While I like the potential for replayability with randomly generated layouts, I keep getting this nagging feeling that there might be a vested interest in that idea from some guy that would benefit from making it more difficult for others to beat his score by changing the racetrack.
Well, of course it could go both ways and someone down the line could get a map that's trivial to clear with all discoveries, but that's unfairness on the other end of the spectrum, no?