The only real compalint I have with the game is the grapple escape mechanic. I don't mind that losing a willpower check makes it hard to escape, but having it completely freeze or reset your escape progress is really frustrating in the late game. I think it would be a little more agreeable if it just slowed progress to a crawl, instead of halting it completely.
For suggestions, I'm a big fan of the Japanese H-Game "Corruption" menus that let you see how your character's body and mind change through the game. I really like the one you already set up, but it would be nice to see more stages of growth as you get more perverted. Having different options for plugs and cages that appear on that screen would also be greatly appreciated.