Well I played through "Moon. DVD", but I'm far from impressed
(so I wouldn't really call it favorite heh)
It is truly astounding, that it was almost done by the same group (apart from two guy), which designed such crying games like Clannad, Air, Kanon. Not surprisingly they've also involved an ending with magical aspect here too, like the already mentioned latter games.
edit: Forgot to add. The english translation was very well done! Really impressive and professional, especially considering the pace they have shown, and the length of the game.
I've only found one typo in the game, and all the sentences were properly nicely structured. Hats off to the fantranslation group, and everyone should keep an eye on their great work.
Spoiler for some minor game spoilers:
I'd estimate about like 70-80% of the H content as semi-rape, or a really sick bizarre fetish (and I pray I'm not going to ever see echi scene involving excrementing, that's just... wrong and stomach-disturbing).
The gameplay was a bit tedious like that (even more so than for example EVE Burst Error or Divi-Dead), IMHO the story was mediocre at best, and the ending was kinda meh.
And I was really pissed, when I had to restart the whole game, because always making the "sane decisions" at the delusions eventually led to a Bad End midgame. How should I've known, that I have to make the pervert decisions all the time? :/ Fair enough the captors are informing about the decisions from time to time, but I had no idea, I have to listen on them. They are evil after all, I wouldn't expected that I have to follow their advices, and choose the "pervert" choices.
Edit: well maybe less than 70% of the eroge content is rape, since there are far too many missing CGs in my extra menu now. However there is one ending only, and I'm sure as hell I don't want to restart it for the third time, just to unlock those CGs...