The body portion should not be visible! If your file is Red_Body.png for example it should only display RED. If it shows the rest, that's a bug!
I don't have plans to work more on the game at the moment as I've got multiple other projects I'm working on in parallel! I might just release the source code though.
The predictions are directly linked to Twitch yes, but the button seems finicky and won't work half the time, oops.