I just finished ir and I enjoyed it.
I really like the sprites. Each of the girls has a unigue personaity, opinion and matching them visuals.
Melody is my favourite. The cute mix of hipsters, hippie and world-saving activist. Smart and sweet.
Adding small city and day-night cycle to improve the immersion and feeling of fallowing the whole live of MC. Not just their free time.
Player could choose what to do before the classes, in lunch break, after school, at the afternoon and evening etc. etc.
Just searching for the girl to hang out with is a bit too simple.
You should consider adding some CGs (for the special moments like introductions of the girls or winning their hearts)
The routes are too quick. Kissing a girl in 5th time seeing each other? Become a couple on the 10th meeting?
it's too easy to find where is the girls you are interested in. There are always in the same places (places where a lot of people hang out or places related to them). You should add at least few more possible places to be for each of them. And the same girl should not exist in 2 or more places simultaneously. (in example: meeting melody in park or in the cafeteria as result of one choice)
Good luck with future porjects.