in order to launch it on Ubuntu, you need to rename Funkin to Funkin.sh, you also need to set it as executable, the last available build is very unstable. After every song the game will crash.
I am also curious of this but I think if you homebrewed the vWii on your WiiU you can use the Wii version as a temperary fix while you edit the source and create a WiiU version to share with the author of this game.
How can I add the Wii and or Gamecube versions to USBLoaderGX? I want to play this on my Wii and be able to use both Wiimote and GC Controller. thus giving me a feel for both. also which DS version should I use if I am going to play using Twiilight Menu ++?
