For those who cannot understand moonrunes, you need to have .ogg (song) and .tja (map) file of the music you want to play in the folder stated before you can play it. But I do not know where to download it. Hope this can help.
Game is good, but... I don't understand Japan language! Creator, help, please! If yes, then in Option Menu, can you put 2 language? ENG-JPN. Thank you creator