Thanks for playing!
You're right, the sync is a little off. For whatever reason, the starting delay is different on a standalone build than on the HTML one, and I had to change the delay manually, build it to HTML, and see how close I was. This is the 15th or so build, I also had unity-player size issues for a while. At that point I was just happy to get it reasonably close. If I find a way to sync the music properly regardless of build platform, I'll be sure to re-upload!