Short, but decent phone game (if you’re into this kind of thing). Its up to you when to quit. Either when you get all upgrades or decide youve had enough.
I got her to level 1000 and she turned into a high succubus. I'm not sure if there's anything after that, but also not sure how long i want to sit here letting the level go up. Might auto click it over night to test results and explore further. (Just to see how/if the title changes)