I went to the website you recommended but I only saw a doki doki wallpaper game?
try this? https://www.google.co.id/url?sa=t&source=web&rct=j&url=https://joiplay.cyou/&ved... Don't know why you got wallpaper but all you have to is download windows version of the game and put like an executable file and put a version of the game and try downloading joiplay renpy extension