Dealing with lack of audio
OBS muted the desktop audio on its own and I didn't realize until after I finished streaming. Should I overlay the BGM or leave it as-is?
Just leave it as is. Adding the music in to try and make it look like you recorded audio when you didn't makes your run look sketchy.
If you're just wanting to add music so that your video isn't completely quiet, make sure you put a note in your run submission noting that you accidentally didn't record audio.
Osmosis_Jones これを好き