I really like the character designs! Very cute yet creepy. I did encounter a few bugs though, if you don't mind me bringing attention to it.
The first one is a file path error for the CG in the Medusa ending.
I managed to figure out that it was typo in the image statement for "medusa_end" where it was missing the ".png" file extension.
Another one is a similar typo with the "black" scenes.
It seems to be repeated in a few scene statements.
Also, the music volume seems to be very quiet by default (I don't know if it's just me).
The preferences menu is hidden by default though, so I couldn't adjust it without going into the game files.
Not sure if you'll continue to update the game, but I hope this helps!