From the video, I had my doubts whether it would work or not, but the particles do fortunately cluster enough to make switching colors not arbitrary. (And so fun enough to make play enjoyable.)
Also (from the description) I thought I could cycle ‘left’ and ‘right’ through the colors by clicking, but it’s hold and drag, not just click. This also works remarkably intuitive, once the misunderstanding cleared.
I did get the urge to put on my glasses or at least install windscreen wipers on my monitor. That is some heavy blur and mist!