SSGs are almost stereotypical to write thinking 'how hard can it be', and it's impressive to see this. I didn't get from the GitHub writeup though what made it,

SSGs are almost stereotypical to write thinking 'how hard can it be', and it's impressive to see this. I didn't get from the GitHub writeup though what made it, specifically, very different - other than lightweight compared to Jekyll. Would you mind explaining a bit more? For example, what's the templating language used for, and how?