Four suggestions:
#1
I don't know if this is possible with the game engine but it would be nice to have mouse overs for all the spells. So when you mouse over them it gives a basic description of what the spell does. It isn't a big deal but would be a nice touch if it was easy to implement.
#2
Often, when I'm asked to explore the college, I have to go to a dozen rooms or more to find something happening. So I end up going to roughly 11 places that tell me "nothing to see here" when there is only one or two locations that have anything going on in them. I don't mind the sandbox approach if there is more than one or two things to do on the map. Otherwise, it may be best to grey out the areas that aren't currently active (nothing going on in them). Again, not a big deal but it would save a bit of frustration of playing musical chairs or the guessing game with the rooms (i.e. finding the one room out of 12 that has something to do in it).
#3
Closely related to #2. I like the sandbox approach so utilize it more. Add conversations with various people throughout the game that aren't directly tied to the story. Make the game a little less VN / story driven. This would give the player more opportunities to add positive or corruption points with the various characters outside of the story driven VN. If enough points are gained in either category, a unique event occurs. You can do this at different stages, for example a unique event at corruption 4, 8, 12, 16. None of this tied directly to the story. This would make exploring the map and various rooms much more meaningful and fulfilling.
#4
The points you gain and relationship points with the various characters in the game seem to be inconsistent. There were numerous times that I thought the person should like me better as a result of my action (positive relationship point) which never occurred. The same happens with the positive and corruption points. With some characters it is worse than others. Kat seems to be the worst as far as influencing points with.
These are all minor complaints (constructive feedback) at best so keep that in mind. The game is excellent and I've really enjoyed it so far! Keep up the great work!