I'm a massive Laravel fan, but Twig would likely be a better template engine. Blade IIRC just does simple regex replacements for certain PHP constructs, whereas Twig is an actual full parser.
Regardless, kudos on the project. It looks like a marked improvement over the normal state of affairs. The built-in templating is far from the worst thing about WP, but it is easy low-hanging fruit to modernize, and I for one am glad to see that effort pay off.