I could be wrong but I believe that I heard that during development he play tested that game to the point that he didn't really enjoy playing it anymore.
I remember reading that he playtested it with his wife and that after some time she did not like to play it anymore. A quick search led me to this quote:
How does your wife feel about the game, now that its out?
Good question. She is looking very much forward to play with her friends :-) She is "a bit" tired of being a playtester and having to analyse every small change in wording or mechanics. She just want to enjoy herself without having to go meta all the time... (which I understand... she has been extremely patient with me).
She is also very proud that everybody likes the visual design so much. She has been driving that part and it's ended up great.