I don't really get it...
I won by I just started to try every object until I found it.
Do the dialogs matter? It feels like they are trying to give you a hint. But I didn't understand them.
I dialogs matter - then this is a good concept but should be a way to make it more obvious. Or at least start with an easy tutorial or something.
And if dialogs don't matter - then I am not sure how the monster should be found.