I can't vote on Twitter, but I think that more food stuff could be great. Maybe stuff like prune juice or laxatives. What I think would be a great addition, is stomach rumbles (maybe with the stomach visibly ''rippling'' when it gurgles), and maybe certain things could make her stomach become bloated and slowly ''deflate'' as she farts and poops. Also maybe you could have a button that, when pressed, causes the girl to clench her buttcheeks and ''hold it'', and when you give her food stuff it shows her struggling, with her stomach growling, maybe accidentally letting out a few farts, until you press the button again to ''let go''.
Love what you do, keep up the good work.