Your method of obtaining and running your Scratch with WL just does not work for me.
First, I made sure I had a github ssh key, was logged in at github, and had ssh-agent running. Still, the git-clone command failed. So finally I just did a direct download using the "Clone button" on your project page, then unzipped (and removed the "-master" appendage to the name of the resulting folder.
But now, npm start generate errors:
> blockywl@0.0.1 start /Users/murray/Downloads/BlockyWL
> concurrently 'npm:wl-*'
sh: concurrently: command not found
npm ERR! code ELIFECYCLE
npm ERR! syscall spawn
npm ERR! file sh
npm ERR! errno ENOENT
npm ERR! blockywl@0.0.1 start: `concurrently 'npm:wl-*'`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the blockywl@0.0.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
...
