Finished the quest.
I can say Level 6 was the best dungeon I've played for this contest. The rest of the quest was a little lackluster, though; there was very little hidden in most of the dungeons and a lot of the rooms were plain.
Overworld secrets were good. Level 9 Boss Rush was also good. My favorite boss in this quest was the Twin Summoners, followed closely by the Mirrorrobe. Splitting darknuts were also a nice touch.
Ganon fight was hard: had to use both potions. That's a good thing.
Didn't really understand the eternal flame puzzle, and decided not to bother since I was so close to the end anyway. I'm guessing...
Spoiler: show
Completely missed the blue ring, bumped up to Red in Dungeon 8.
You can see my bug report in the previous post; keep an eye on those secret combos!
Anyway, thank you for making this quest.