This is really excellent stuff, super cute art and very smooth animation. :) The only thing I'd say is, it's a shame every separate thing has to be max upgraded to get ending 2/2 (I love breast expansion and pregnancy, but not so much the phallic clitoris, so I ended up being stuck and not understanding why I couldn't get the ending).
I do hope to see more stuff like this! It'd be interesting if you could have various endings depending on what you changed. Like a sex slave ending if she becomes super dumb and horny, a milk cow ending if she gets ridiculously busty and milky, etc. On that note, wouldn't mind even larger sizes to grow to and lactation for a future project. :) Just a thought though.
Thanks for your hard work on this!