Great game! I love the art and the writing, I think this has a lot of potential. I'll be looking forward to updates. But, I do have a couple "complaints", although they're more "things that I noticed that could be improved to make this game even better."
I noticed an inconsistency with the cup sizes in the breast expansion sections. On the lvl 2 dialogues, it says "increasing from E to G", but on the final stage, it still says "increasing from E to G". If the intention is that this process of increasing from E to G is happening across these two transformations, it could definitely be communicated better.
Also, I'm a bit disappointed that the hard nipples didn't persist outside of the initial transformation event. I like nipple pokies a lot, and even outside of that, it'd make sense for them to show up again maybe during the regular talk dialogue when she moans, and definitely during the first part of the final breast expansion scene where she actively talks about how good her nipples feel. And it doesn't seem like it'd necessitate making new poses, either. (Admittedly, I haven't gone into the bimbo TF path yet, and maybe that has more nipple pokies, but if not, I think they should also happen in the base biggest size boobs poses.)
Anyway, yeah. I'm definitely eager to see what sort of TF you have planned for next update!