So here is my feedback.
Firstly, I'd say you should add some content where Steph isn't just about to pop. It's nice, but progression is nicer. Perhaps even if it was just one screen with Steph rapidly progressing and you just changed the belly.
The little puzzles weren't too bad, and I liked them. Not sure how you'd make them better, but I wouldn't mix it up too much.
The art was the real draw for me, so any excuse to see more of it would be great.