Correct me if I'm wrong but according to what I read, what he is going to do is a remake of monochrome, that is, to do it from scratch with more functionalities, cg, positions, etc.
On the other hand, what you say is true, inusuku has many projects and apparently he changes focus from time to time, also, as you say, he gets sick hehe (I've always thought that Japanese people tend to get sick a lot).
But hey, we don't know how many CGs he'll redo or which ones and I doubt he'll say it since he doesn't know that there's a girl coloring his game
.
Just thinking that I will spend 2 nights or more coloring an exterior cg for him to redo it later totally demotivates me is a lot of wasted time.
That's not to mention that suddenly it comes out with more surprises with the other image folders