I have heard great things about this free game/experience and decided to
try it out, but I can't find it in the desktop app store or the store
page in VR, so I googled it and got it from the web page. It displayed
as "Purchased" and I can also see it...
Have you tried putting your headset on first? It is usually on standby
if it cannot detect you putting it on, therefore returning only black
screen on the desktop. A foolproof way to check if your mirror is
working properly is putting the headset on,...