Of course it is. But all color interpolation usually happen in the color model used. What makes this one different is that the lines are not drawn in the polar HSL coordinates, but are cartesian instead. The results are quite different if you just interpolate color in HSL as you can see here: https://codepen.io/meodai/pen/GRyjQoZ
Yeah, it is obvious. But word "interpolation" isn't to be found anywhere in the text.
IMO, having something like "color interpolation in HSL Cartesian space" would make it crystal clear what the tool is about. Also, "interpolation" is the keyword I'd use to search for this on Google. So, would likely be an SEO.
Unlike OP, I think it is clever to use words like "enigmatic", "mystical", etc. Not my particular taste, but it is a good branding.
About the transformation. Most libraries can interpolate on CIE's XYZ-D65, but I'm not sure how this would compare with doing operations at Cartesian coordinates of others colorspaces.
The widget from codepen also looks great. You are really good at designing color widgets.