Very cool game, nice art + i like all the easter eggs and memes sprinkled around, can't wait for more content;
Saw the dev comment at the end; i'm sure there is still more way to exploint that one fetish, or maybe find some stuff related to main fetish for more content.
Easiest way to expend would be "Futa" option gives something new to grow. Nipple expention. optional to fadeing, how about orgasm (pink rooms)?
would be nice to have some secrets/traps/puzzels (besides the button that need 5500+) where you need to have a min/max amount of silicone. lose board she falls town if you have above X, lose by stuck in the wall. wish for a bathtub scene where she bath in the silicone and slowly grows.
Since the Dev probably want the game to be beatable without upgrades, place them in optional path.