I'm glad you like the game! And thank you for all the kind words :)
To answer your questions: More College authority is definitely coming, but probably not very soon - I want to advance the Main Girls' storylines and the main story a little bit more, first. Also, the game won't force you to become more corrupted/evil (or more pure/good) but the ending will reflect the choices you make. So if you choose to kill certain characters, for example, or set them free (or recruit them) then the ending will change slightly to take that into account.
Basically, everyone should get the ending and character that they aim for :)