I love Scheme but have always reserved it for high-level programming--algorithms and such. I've always been aware of those Scheme-2-C transpilers that I could maybe use for low level purposes but that feels like cheating to me. However, recently I've discovered this one bootable bare-metal Scheme implementation yet have no idea what tools the creator used to make it, though I very much wish I did. [https://scheme.fail/] Any ideas?