The minified file in the repo is 22 KB, to the standard one's 26 KB. It's probably kinda pointless to minify, yet have all of the potential options in the file. Maybe one big file, but individual minified versions?

Is there a sass preprocessor that does tree-shaking for CSS classes? If so, that could trim away the stuff you don't need.

The source of the project is compiled via Sass and each hamburger type is its own partial. Simply comment out the ones you don’t need before you compile, and you’ll only get what you need.