The graphics style is serviceable for a prototype, but I hope it gets better. I like the backgrounds and most animations are fine, but the "normal" movement looks and feels awkward.
The stealth-gameplay was simple, but surprisingly fun. Would be cool if that gets preserved in future versions (feature creep sometimes kills cool features from early stages).
Ideas:
A) A bit more verticallity? Ways to go over or under enemies, perhaps with other threats (slipping from trees, colliding with drones, or tentacles in the sewers).
B) or to have more situations where you can kite the enemies to bypass them (with the risk of walking into more of them).
C) Would also be kinda cool if there was something to do while getting knocked down, say either struggle the enemy off (makes you lose extra energy, but no risk of pregnancy), getting the enemy off early (using less of your energy, but not reducing your risk) or as the last resort, trying to make them pull out the moment they cums (might spare a little energy and reduce the risk, compare to submitting).
D) If you're already using AI-generated portraits - why not make some more Girls and use these as "lives"? Say, if you lose a "live" you start the level with a different girl, that followed the former protagonist - who is now either either a victim to be rescued or a wandering monster trying unload her womb into the new girl. Play with that girl, until she escapes or you have to switch to a different following girl.
Technical Problems: I couldn't close the sound menu. Am I overlooking something? Closed the game and restarted it.