I'll second looneybits' recommendation for buch's dungeon set. Although, for the style of play, the Gameboy-style graphics do work quite well.
I'll also second noofbiz's comment about the js alerts. After a few chests, Firefox actually asked me if I wanted to block all alerts from the web page!
Otherwise, great work! The AI is relentless but the first time I out smarted a pair of globbers and snuck past them to grab the treasure felt great! Music also does a great job of setting the atmosphere.