Very well thinked over
Puzzles are somehow accessible when you don't look for the gems, but some are really hard when you want 100%. This is a major pro of this game !
Last lvl can be done by completely skipping the top right corner though, and with very few items.
Bonus room 2 and 3 were the most diificult to me (especially room 3 with gem).
Graphics are what they are, but even if they give you the original D&D feeling they still are ugly. (yeah, original D&D graphics are crappy too ^^ )
Somehow, the music is not annoying even if it's the same loop again and again. That's a performance I think !