I've been programming since before you were born... and this is the most impressive hacking feat I've ever seen.
A single executable, that doubles as a valid ZIP file, that you can put a complete website into, also doubles as a valid executable on Windows, Mac, Linux.
The build infrastructure is a complete reworking of C to make it far more portable than even K&R thought possible.
I probably wouldn't have believed it possible, but here it is!