I'm super glad you like it!
Yeah, a lot of the text from the early traps only reflects breast growth, so I should probably change that. When the game first came out, it was using a set of portraits for Jane that had almost no butt or lip growth.
Jane's "base" expression changes slightly as her lips grow, but the one you see at max size in the current demo is the one she will likely keep - just with her lips gradually taking more of it.
I do have some things already planned regarding that challenge modifier, don't you worry!