I have to say, all of Day 1 ( I did Keisuke and mom) are probably one of the best, if not the best, experiences playing a visual novel I ever had. After that it's quite unfinished, sadly.
Honestly, if I could I'd give you infinite amounts of money just to make me feel as immersed as I felt during those first hours. This game is great, I hope to one day see it complete.