that's pretty good tbh, maybe not perfect, but close enough only a seasoned theremin player might notice.
i can't put my finger on what could be improved, it is more the performance issue i think, as how we play does have an impact on what we play.
maybe if you had two xy pads and 2 mouses you could get better? as theremin is two handed after all.
but that's going a bit far, what you have definitely has the eerie quality
