I loved the concept and minimalistic style of the game! Playing on the piano was a little bit tricky, but overall pretty intuitive (speaking as a something-of-a-musician-myself :D ). The story was simple and touching, but I lacked a deeper connection between actual gameplay and characters. I think it might be very cool to think this through and create much more meaningful gameplay, since it's very exiting idea to try and tell the story outside of obvious arts and visuals.
For example, I would really like to play the whole Luna's Song in the end by myself :)
Thank you for the game <3