Good story. overall I can't really say much without major spoilers, but I will say that there are some parts that just bug me.
Your art is very cute and a great fit. Audio on the other hand, while I know that it is common to have only piano in VNs I really don't think it should.
Gameplay is obviously limited to 3 choices. Though there are I believe 60 different combinations of choices, only one actually has a different outcome. Thankfully Ren'Py comes with a skip button.
All in all good job!