Since your name may be difficult for Japanese to pronounce, you may be asked to provide a nickname, e.g., “Mak-san” for Mr.
Japanese may use nicknames or first names among themselves but foreigners should refrain from doing so until they are asked!
I looked over the data files and the images, and some of them are unused in the final game.
If you want to find them, they are delimited with var filename=" and final ".
No executable file, only plain text files that make up a web game.