Hey empe3, I made this account just to tell you how much I enjoy these games.
Both Luna and Sana are really fun games to explore.
What I like the most about this "formula" is that you can find Luna/Sana around towns and check what is happening to them.
I like exploring every corner in games and it feels great to see a new image of the girls and go like "Oh, new event, where is she this time?" And then search for them.
I really love these games.
Keep adding more stuff but don't forget to take breaks. Have some nice meals and sleep well to keep making great games.