I never noticed that Code Monkey was mono.
But then, so is most of my stuff. Some pieces (Happenstance and Birdstance, mostly) are designed to have some channel separation here and there, but most are not.
Mono is underrated. Which is not to say that stereo is overrated. But if the music is good enough, the mix is meaningless (within reason). Code Monkey would be a great song if played on a blown speaker from the other side of an empty warehouse.