Not have quick transformation is fine. I would just find it frustrating if I wasn't able to get the forms I liked back or the ones I missed. So I am quite excited to learn more about it.
I look forward to seeing these reworks I imagine you are putting a lot of time and effort into them. The rat tf thought was mostly because of that rat swarm basement quest. I just felt a little bummed that the tf was only in the bad end (which I found very fun). I was also caught off guard when I saw the giant rat men sprites walking around. But when I went into battle it was "normal" rats.
I love that you liked the pickaxe idea! I just felt like something could be there. It's really nice to have various secrets you can find if you pay close attention to your environment.
I'm conflicted on it, I like the thought of it leading to an end. But I also liked the idea of it triggering an event. Maybe resulting in you and your bimbo army "fighting" the dragon and after a certain number casts of the bimbofication spell. Turning the dragon into a bimbo dragoness. Maybe after doing so it opens up new options/special equipment for the succubus form (after all, I believe it's implied your goal is to corrupt the world as said form). I wasn't aware of egg laying being an option and I am 100% all for it!