There should be a way to turn the sound off so I can put my own background music (65daysofstatic) or something like that. There may be that optio, but if so I don't know how to find it.
Hey, if you're using a PC you should be able to turn the sound off in the volume mixer (right click volume settings) for individual programs. It's maybe not ideal, but it does the trick if you want to get rid of the sound.
If you're on Mac or Linux then fuck if I know how to do that, but I wouldn't be surprised it's also possible through similar means.
(no affiliation with the dev, by the way, just thought I could be of some help)