I totally understand. It will be very difficult, but it is critical - absolutely worth pushing your knowledge and skills to do. Muscle level, eyes, Hair, funparts are all first starts. Perhaps integrating live DAZ-model rendering into the game is worth doing. (See: Certain TWINE/Sugarcube Projects using webgl to do this.)
Incompetency is not the same as ignorance. Games are very hard with all manner of use-cases. Players are mashing buttons, opening and closing menus - changing the state of the game and its systems as fast as they can push buttons. Something is bound to break. You just learn what gets broken and put in the guards and controls to deal with it.
For now - outside of that technology - just keep planning, structuring, and implementing pieces of variation, surprises, fun stuff, and dialogue. You have something here. Work hard, and just keep improving.