You could borrow heavily from this: https://iconoclast.neocities.org/Sonata%200.5e/Sonata%200.5e
If you focus a bit more on graphics and shorten the story elements, that would be pretty cool.
Social scenes that vary with equipment would be pretty awesome too.
Also, "suit" upgrade paths are the way to go, maybe similar to this (personal edition): https://tevazi.itch.io/release-the-hypnodrones
If you have multiple paths (chastity, f-machines, ...) that would make it interesting as well.