Great work Lucas;
You're going in the right direction! for the near future, I suggest you to add a cli, connectors, simple symbolic calculation on notebooks (take some inspiration from calca http://calca.io/examples), offline support and fully encrypted namespaces.
That will put you miles away from everyone else in the field :)
You're probably busy with the launch, but you can contact me if you wanna discuss the list above,
Abraços