I've been playing this game for the last couple of days and it's awesome! Do you plan on keep developing it? It has a lot of potential!
I've found some small improvements/bugs:
1. Add assignment to the "Owned girls" list (School, Ceremony, Rest, Hostel, Public Toilets, etc). Also, the possibility to assign from there would be nice
2. Everytime I get the 13th girl I can't save the game anymore (going to Save, tapping on a save item, nothing happens). And then when I close and reopen the game all my savings are lost, and I have to start from zero
If you don't plan on continuing with it, what about making the game open source? So it can be improved by the community
Edit: updated 2nd item (the bug) upon findings