While I'm really happy the game has found a new audience, I know that a lot of people want what was in the first game and while I'm going to be delivering a lot of that in the October patch I know that this game is just always going to be fundamentally different. I feel really bad for those who don't enjoy the game as much as the original...I really tried to make this its own thing and I can get super depressed reading some of the reviews from super fans. Making a sequel is the most difficult thing I've ever done.
I think this is a super interesting thing to talk about in general - indie sequels. What do you do? Change too much and invested fans are turned off. Change too little and people ask why even make a sequel. Expand in scope tremendously and people who played your first game maybe because of the novelty of a bygone genre don't come back, and the sequel doesn't perform as well (thinking of Grimrock 2) here.
Just thinking aloud - your task is a terribly difficult one. Hope CSD2 does great!