Good job, congrats! I think you just found a niche which is rare in gaming. (nicely written characters + female protagonist + some lewd)
Liked
* female protagonist
* game is a nice middle ground, the classmates are quite interesting, but there is also adult content. (usually one of these, lewds or writing is missing)
* I usually hate minigames, but these stat increases with classes grew on me. I don't know how much work it took to make this not annoying :)
* I really like that the PC starts off as inexperienced, and you actually have to advance. Most games start off the PC with a natural talent level of a succubus
* I really liked that there is a variation in body models used, not everyone is a "super slim, but cup D"
Room for improvement
* music I think. There is awesome, royalty free music out there, which would add to the experience. This would especially add to the university feel, if you choose punk/ska/etc. But I understand that it takes an ungodly amount of time to dig through the trash to find one good song. You might want to use the fans for recommendations tho :D
there must be beter tools to search, but something like this:
* if you can find it, even bigger variety (like curvy or buffed) in body types would add I think