So I got to the point where that first girl you capture it says there's no more content for her, is there any more content for other characters?
Other thoughts: it's annoying how the game prevents you from doing things even though you know you're supposed to do them. Like you can build the training robot but you're not allowed to train until you get to a certain point in the story even when your character says that they need to train. It's a little nonsensical and could be streamlined better.
Is the jizzing in the milk at the coffee shop meant to lead anywhere? Maybe have it that you lace the milk with like a mind control chemical or something similar.
Also, I'm not the biggest fan of having to brain damage the girls in order to control them. Maybe you could add research other ways to break them and turn it into a choice. Like maybe you could also learn using pleasure to brainwash them, or maybe pain for like a bdsm option, or maybe have romance option which causes them to trust you which makes brainwashing them easier (and you can decide whether or not you want to actually romance them or that was just a play) and say different characters respond more to certain types of brainwashing. Like Wonderwoman responds most to a bondage route, Supergirl responds to romance most, Catwoman responds just to sexual pleasure.