I like the music, but consider starting it muted and only downloading 3.6MB of mp3 if someone unmutes.

This might be a good idea because it's typical that web games like this usually don't play music or even sounds. It's kind of a context thing? If in a game app, music and sounds are expected... if it's a website, not so much.

This would also help reduce the fairly large download that makes the game a bit chonky to load.