Thank you! We don't have that option but we are thinking of releasing a more complete/polished version of the game and I would love to add that feature :)
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I'm not the one that did the audio (my partner did) so the answer might not be the most precise! But it took quite a lot of work, he had to create the whole track looping correctly, make groups and make sure everything worked together. Most of his time during the jam was spent on the track!
To implement it, I made it so when you activate the track you actually unmute it! So everything is playing all the time, you juste mute or unmute part of it. (otherwise it would be so hard to time it properly)