It’s just a very basic Openbox install of Debian. It is the evolution of Crunchbang from some years ago, which was my go to and so I have continued with it. I like Debian and usually use Openbox so it is a natural and easy way to get that running, plus they have an excellent little community.
Itcreally is good. Nice base colors, not too contrasty, but also not too soft. Nord is the next best imo but often just feels too blue. Gruvbox seems just a bit more neutral to me, so I gravitate to it more often.