The UI looks quite nice although the scrolling gets a bit fidgety especially on the mobile version. Its readable/ the text looks quite nice with the background and music it feels nice to interact with at the beginning with the sliders but some of the pictures to me at least make the UI get thrown off a little bit if you know what I mean (it feels like it gets progressively sillier?) The job section is where it starts, the two images on the right ,I think the pink background on the one does it.( I can maybe help give some better images for them if you'd like?)
The introduction of the mistress looks great as is, both the background and the model art. I suggest keeping it but maybe having pages to flip through to select other options for mistresses or possibly masters at some point. Except for the light colors coming out of nowhere it looks well put together. (Not saying the light colors are bad its just the rest of the art style throughout the introduction kind of feels like it gets thrown off by it in a way)