It just looks like a text editor with overly flat, square design which is synonymous with Microsoft's current windows themes?
About the project, I build Modern Editor on Universal Windows Platform (https://msdn.microsoft.com/en-us/library/windows/apps/dn8946...), which is a replacement for traditional desktop platform. Therefore, the app doesn't use NW.js or Electron: much more lighter (2 MB at the moment compared to more than 30 MB of Electron) and all the APIs are called directly through WinRT (aka. more native), can work on phones + Continuum, PCs, tablets, IOT or even Xbox.
I hope this will answer your question.