Hihi, as I said in the application description, I am aware the camera tracking doesn't work in Linux and I'm not smart enough to fix it lol. I included the build so people can use the mouse tracking mode if they want to, if the application even runs. I have not tested it. I basically just set the Unity build to Linux and exported it.
Thanks for all the info though, the custommouth png is probably a bug I have to fix either way