Great work :) This is an awesome idea for the Quest and implemented very well.
Some suggestions:
Place that image with the controls in the game somewhere. Maybe as a poster, or make it so it comes up when you click the exist game button in less than 3 seconds, and then maybe have a text appear with a countdown as you are exiting an emulator.
Teleport controls. I can live without them, but a lot of people have trouble with motion sickness, so it would be great to have teleport controls.
Physical controls - Maybe have it so cabinets have buttons and sticks you can grab and click, or at least make them move so you can tell they were moved or clicked. That would really add to the experience I think, but its more of a "nice to have" feature compared to the first two suggestions I think.