1. Noted, the buttons are confusing. In the meantime: "download" downloads the original font that I made, "download edited" download currently edited font (if you have made any edits) in .otf format, "download json" downloads each char definition as coordinates, and "restore json" lets you restore a previously edited json so you can keep editing your font. Everything happens locally, there are no servers.
2. Yep
3. Do you have something in mind? :)