Buxom and MoA go in different directions. I initially wanted to make a game where growth happened during gameplay, but I really wanted the growth to be a long-term goal. The level up mechanic allows that, I can build a story around, it's something you have to work for, and I can expand the concept as big as I want, whereas growing during gameplay you would reach the limits pretty fast and it would be hard to enjoy the journey. Buxom being a mod of an existing roguelite had its limitations, and with MoA I just went towards another experience.
I do intend to iterate on the game and engine to make it sexier. I have a lot of ideas to improve on that point but it's gonna take more time to implement. Chibi will stay for pure the icon in combat but more is gonna get added around that to make the whole growth and horny more enjoyable.