This is a game where I found myself resorting to hints. Not because the puzzles are particularly difficult, but because the parser was frustrating, to the point where it was not fun any more, and I just wanted to finish it. In addition to guess-the-verb-issues on every corner, most of the progress is being done with “ask/tell person about something”, which in the end resulting in me adopting a brute-force approach, asking and telling everyone about everything in turn. On top of that, I also ran into several cases of runtime errors – nothing game breaking, but certainly adding to the frustration.
I would like to point out, however, that I loved the premise, the characters, and the writing of Deelzebub, and I sincerely wish I had played a more polished version of it.