Small remark about the item title menu bar (on top left) which seems a bit small according to me. One has to press left or right arrows several time in order to find relevant items !
Great job guys !
What we are mostly proud of that may gratify your intellectual curiosity, is that everything is client-side, there is no back-end. Even when exporting. So you can download a zip of the application, run index.html and you're good to go.