Sorry, no technical comments but a UI one: Please change the font/style. Depending on monitor color settings, the paragraph text in Retina Thin is really hard to read, but even on my other monitor it’s still a problem with the letter "s" [0]. I think it’s a problem with the thinness and white on dark background. It was hurting my eyes and permanently distracting me while trying to read the copy.
Thank you for this feedback, I'll ask our designer for his advice. Perhaps we can detect high density monitors and only do Retina in that case or something.
[0]: https://i.imgur.com/Ia0roKn.png