New animations (Perhaps they were before, but I did not notice). Physics belly. Changed the invitation menu. (It is now prettier. Smoother button corners?). And it seems to me that the appearance of the characters and the belly has slightly changed.
Yup, Uajaka should definitely make a change log post (and make sure to categorize it as Major Update) ItchIO explicitly state that doing this will bump up the game in the search rankings so you should always make a dev log after each game update.