As a former anti-ntr and anti-sharing, I believe I can give my opinion.
One of the things people (fans of these genres) were most looking forward to, and (apart from some fluid animations) had a lot of clunky and horrible animations, it was very reminiscent of games from 6-7 years ago.
Bestiality Route: Although I'm not a true fan (but I play this kind of content when a game has it), I believe it was the best done in this special.
Girl Route: Could very well be in the main game, I saw no reason or that it added anything to the game (terrible animations, especially Melody's).
Total sloppiness or haste, could have waited a bit longer and polished the game better.
NTR Route: Man, it's a non-canon extra, make D a bum, even D and Martin's scene in the original game, felt more NTR than this one. Make it a real NTR, ganbang of D with various sticks, an orgy...
Summary: It seems that it was done without any kind of will, simply to satiate the desires of many of his supporters, who supported him for a long time, and who were just waiting for this moment, and it was such a disappointment.
As I said, apart from the bestiality event, the rest was just as vanilla as the main game.
Personal opinion: This game was and was meant to be totally vanilla, without any other men involved. But since it was included, let it be done right.
Give your backers, with these specials, what they really want, not this vanilla stuff that could be in the regular game.
But since this is only part 1 (and I don't even know if you will have others or how many there will be), you still have time to redeem yourself to your audience, (NTR and Sharing).
To the moderator: I know I said I wouldn't comment on anything else regarding this developer, and you won't see my comments in his games' threads. But I just wanted to leave my opinion here, where you will have no discussions.