Hello Da Vu,
I’m not sure which CGs you are referring to, but there is the possibility to use some other works by Atella to add more scenes, if he gives me his permission for that, however, the CGs I’m aware of don’t fit with the game’s animations as they were made for another use, let’s say that some scenes use a format more like a book and have few pages (8-12 images per scene maybe), while the animations on the game use roughly 100-120 images per scene.
So as much as it is a possibility, the quality just wouldn’t be the same. It is still something I’m considering as an option, given that.