Loved it. After playing One Thousand Lies (another short, sweet VN ported to Android) I was craving for something of the sorts. Good balance between a super engaging story and pace. Normaly VNs tend to be slow-paced, sometimes way too much to my liking, and this hit the sweetspot, and for that I'm grateful. I don't know if this is your first shot at writing and putting it out there. If so, kudos to you. Massively surprised. I've only watched 2 out of the 4 endings (that I would consider to be the good and good+ endings, perhaps) but I'm glad about their conclusions. :)
Only thing bothering me is... what was Grace's backstory? I feel like it was "there" but I wouldn't mind somebody clarifying it for me.