I like the concept, it's fun and I think there's potential. In terms of feedback I have two major points. One, I think the UI elements should sit over the "first person elements" i.e visible boobs and lips. A few times I couldn't read the text options because my oversized lips or tits were blocking all the text.
The other is a major point of feedback, which is that I couldn't solve this dungeon at all without hints. I tried a few different paths and kept failing so ultimately I read all the hints, and in my opinion, the overall solution really isn't obvious. Needing to be a bimbo to tame the dragon is kind of an odd choice, and it didn't occur to me to give myself bimbo proportions to avoid the original spell.
However, I think there is one very easy change to fix this: don't obscure the second option text. On every scene, show both options, but just don't allow the ineligible one to be selected. If it was like that then the first time I ran into the bimbo I would have been clued in that I could pass her if I looked like her, and when I meet the dragon, the "dumb" dialogue choice would imply a clear link to the bimbo path. I believe I could have solved the dungeon with no hints at all with this change in place, and I think that'd be a big strength for a puzzle game.