The object/component system looks like a Unity3D ripoff. Even component names ("MeshRenderer") are unchanged from Unity.

Also it is interesting that it's written in JS without any higher-level technology like TypeScript or Dart.

A little bit off topic, but every time I try any kind of similar application (this, a CAD, a PCB editor) that is implemented to work in web browser, I lack feeling of "stability" of a desktop app with all the files stored locally - I would rather use a desktop app with inferior functionality.