Hi. It's not physically possible to release a single update that contains all the routes and endings that Turning the Page will feature. v0.19.1 is not unfinished, the story is simply splitting into several routes. To complete everything at the same time, we would have to do a single update in about 10 months with all the choices and all the endings completed, an update containing 30+ CGs and something like 450k words or more. I think you can understand that is not possible.
As we also did with our last game, Turning the Page will have each route completed one at a time. This is how we work on our games, continuing 2/3/4 routes all at once would mean that each of them would see very little new content each month. Ultimately it would be bad for anyone, for us to work on it, and just as bad for the readers.
As for Sophie's hair color, the one you showed is obviously too saturated. Sophie's hair color is this:
It's possible that during the png extractions of the new sprite, some hue/saturation/luminosity or color balance layer was activated by mistake. I'll check this and version 0.20.0 will have the hair I just showed.