You're right, the demo is far from user friendly. Thing is we completed 90+% of the current functionality last year and then kept working on integrating it internally and the rest of our milestone. At this point so much time had passed that the open source prospects almost disappeared, so I decided it was now or never to release it to the public, since we had 4 months to "prepare" it and nothing happened. To see it gather over 1000 stars on Github is mind boggling, I didn't expect 100 honestly. The demo page is what I put together when showing the grid around internally as work in progress.