Thank you very much for the comment! This is my first game and I find it quite imperfect, so you are being quite generous, haha.
I am considering remaking parts of the game to bring it up to my newer standards, and that should come out eventually as a free update.
As for Vivian, she is a stronger-than-average woman in the Muscle Maidens Universe, which is this place where all of my games take place. It's basically our own reality, but women are the (literally) stronger sex, and the gals easily gain more muscles and strength than men. As for lore, I might add more in the remake of the game to satisfy curious minds.
Also, a sequel to the game has been announced and is being worked on as we speak, although its production has met a few roadblocks so far so it won't be coming this year unfortunately.