Well done! That was a really good series using sweet and scary music and fine drawings. I've played the first two parts more than two years ago so some details may slip away from me, so i'd be grateful if the author gives an idea of what i've missed.
First, the interpretation of the fairytail in such way does make interest (those demons in the game are different: no 'skin-on-bones' wings, maybe no tails and horns - and i like it! And the mechanical demon creatures! they're just magnificent, like, uh, idk... the Daleks (BBC related) :D). Second, there are some puzzles that make people think, and that's also great (unless it's a thought to watch a playthrough =) ). And C - No-no! The Third thing is the sound. You used proper sound guys, and nothing to say more, nah ^_^
And the last - of course, such a game must contain some humour of any kind, so... it's there, and its kind is fine too.
Btw, found some small text wrecks like:
[SPOILERS!]
The "other" demon's words: "He does not makes deals." (i believe it to be "make" there)
Merappi's words: "... my end of the bargin." ("bargain" i guess)
And i didn't quite get if the symbols do have usual meaning like naming sth or anything else...
All in all, that was a lovelyscary and fantastic game that's worth of the highest rating.
Thanks ^-\|