Finished it today. 12h40, 18 treasures, about 34000 tiles moved to.
Nice mod, even better than the Master Key which was already great. Some negative points:
It became much less interesting and even disappointing in level 13 and after the cross key door. Seemed like you had no more ideas and just put monsters and respawners everywhere. As others, I did not enjoyed these parts.
Also, it's a bit sad that there is not storyline. A game with your map design, a story from Treybor (the Last Laugh), some great ambiance and ideas from Skuggasveinn, and of course assets from Daniv, would be something amazing for sure!
About the dragons (nice monsters), level 9, I don't understand why they cannot move to the tiles closed to the walls. It makes the fight easy: you just have to move along the walls, the dragons won't reach you. Same in the 'last' level: there are apparently some invisible blocks for monsters, so you can stand behind them to prepare your attack.
Anyway, very nice one, I'm sure I'll play it again some day.