Hello ! I've played Backrooms and it was enjoyable, not really scary, but those bright rooms and the sounds did the job there ! And it got me once ( well the character's scream did it, I didn't expected it, as I've seen nothing  before the scream).  

Now, I had one game where "friends" didn"t appear ( well they did for a minute then nothing happened, no spawn, no monster sounds, just the buzzing lights and the music ), unfortunately I don't know what happened here, all I can say is that it stopped after a minute, last monster sound I heard was the invisible one, in the back. ( And it somehow add a creppier atmosphere, being alone in those rooms :p ) 

Anyway, here's my playthrough (Medium, then Backrooms difficulty). It's in french, I'll add the subtitles later in the day. 

Thanks for recording your game play. Yeah, it seems that the enemies don't spawn in some cases... I'll put that in the bugs section.