Hey, I just noticed a Mac version exists! Woo! A shame about the music desync though. I wonder if it's just not starting the music until it has a non-zero volume... maybe loading the B track at like 1% volume at startup would help.
Yeah, for some reason the bug occurs only on Mac version. Temporarily I don't have access to a Mac so can't try fixing it, but I'll try do something about it in the future. Maybe I'll recompilethe project in GameMaker 2 once I switch to that version. Not really sure if it's a bug in my code or GM is just handling the functionality differently under Mac module.