I'm a fan! Some criticisms: controls are a little difficult, I haven't been able to consistently control movement vs camera angle. You mention mechanics will change in the future, but personally I don't like the way the stomach capacity functions: I'd rather spend most of the time /overfilling/ her and get growth from that. Also, it's unclear if just her stomach or also her ass is expanding? Maybe different food causes different growth?
All that said, it's a great start! Looks better than many of the other games I've played with similar progress and content.