Thank you!
Yes, we absolutely could have used more time to implement more informative tutorials. The vanishing 'E's is by design, there is a small '?' button in the top that toggles them on and off, so they are meant to go away after the first time you use them, but should turn back on. As the for music slider, I believe that's because of an HTML bug that we were tracking and never managed to eliminate. The end of the game on HTML only, spits an audio bus index error on js, so we took a hatchet to the audio buses in an attempt to isolate the bug, but never readded the Music bus back to the game.