I love your feedback, it energizes me to keep working on the project.
a. About the breast size. Right now I think there is no point in making it by code, I should just draw N sprites for the upper body. Then it will be possible to make a version when breast shape depends on clothes and breast size.
b+c. I was thinking of adding girl's words that depend on current progress (with gag she says “m-m-m-m”), emotions complement this idea well.
d. I'll think about it. VFX is my weakness. Examples from other games will help me.
e. Animations will probably come later. Right now I'm concentrating on clothes.
Regards.