yep you have to start it from the select screen to get the music. if you play straight through it glitches out.

also, the intros and outros to act 5 levels have wonky sprites with the bombed out car appearing and disappearing depending on what floor youre on. Sometimes its upstairs, sometimes its downstairs, etc. I reported that bug to cactus and to my knowledge he never fixed it (there was the 2017 update and I haven't checked since 2016, though).