I failed at making the game run smoothly on web which leads to the audio stuttering. In case you are curious, beside the binaries, there is a YouTube video at the bottom of the game page which showcase a play-through with non-stuttering music.
I incorporated music on Tuesday after spending the whole day in front of my DAW, realized late that audio was not syncing, fixed the sync issue Wednesday morning, then realized it was stuttering and frame-rate dependant. At that point I had to go to a job seeking event so I just let it be. A bit frustrating but that's part of game jam shenanigans. I wanted to start audio earlier, but I lost a lot of time understanding lighting and fighting color blending.