First off congrats on the release, really liking the fonts! I saw that the ligatures changed the checkmarks and crosses in my .todo files using the todo+ extension. I'm not sure if this is intended as the characters were not in the ligature list on the site.

Works: (without ss03 without ss07)

Looks off: (with ss03)

Looks off: (with ss03 and ss07)

Here's the text:
☐
✔ @done(23-11-09 23:44)
✘ @cancelled(23-11-09 23:44)

edit: there is an easy workaround if this is intended:

  "[todo]": {
    "editor.fontLigatures": ""
  },