Thanks for taking the time to play and leave feedback! Yes, this issue didn't show up during testing, and initial investigations suggest its a CPU / web browser resource issue on some computers., but i cant be sure, and need more time to get to the bottom of it.
The music was by LTWes Music, and i understand that they are in the process of putting together an EP of the music and uploading to their Soundcloud page. I'm sure they will post here to let you know when that goes live.