Criminal Girls 2 isn't going to advance any genre very far, but that was hardly the point. The original was borderline smut for teenage boys, or disturbed men, and its unlikely this will vary from that template.
The dead/undead girls must find the real criminal among them in a vaguely fun RPG, while atoning for their own sins with hefty amounts of tickling, spanking, jiggling of boobs and so on. The limited edition version rams this home with a sleep eye mask with one of the girls arses on it, and an optional whipping crop.
There's a bit more detail in the RPG visuals this time around, with things looking a lot less pixelly, but I seriously doubt there will be much effort to expand the gameplay.