The changes to Melanie's story line are all new and in 0.30
I see multiple people claiming "saves work" and yeah they MIGHT work, I loaded mine at first and it didn't instantly crash, but your missing like 80% of this update if you load your saves, Melanie's whole beginning has changed.
Now that I've slept on it, I'm also sad about the lack of content too. For the record I'm mainly sad about the change to Melanie's story, but other than that there is so little new stuff to see
the scene with Melanie and Tiffany was hot as fuck so credit where it is due but again that's just one scene.
Now the dev did mention some behind the scenes coding changes (I didn't notice too much TBH). The flow kinda got worse to me because you have nothing to do in the mornings until you unlock the twins house, Melanie mainly meets you at noon. But like 4 events happen at noon so you cant work on multiple girls in the same day which kinda sucks and made me keep going back home to sleep and skip time until noon again. So gameflow got a little worse as well.