This is the "Slanted" theme for bolt, built upon a variation of the same flex grid that Base-2016 is built upon. It is very minimalistic, and only supplies three main twig files by default.
By default it only has 6.9 kB CSS and 1.7 kB JS, so it should be very performant.
Not maintained, will not be updated. If you feel like taking it over, open an issue and I'll transfer the repo. A plugin to integrate foxycart with bolt. See http://www.foxycart.com/ and the github readme for more info.