This is really slick! It's missing a few key features, like letting me modify some meta details of an object by clicking, or easily deleting an object. I'd also like a way to more easily create a polygon without zooming in really far to put the final point very close to the original point, instead of ending the drawing.

I use http://geojson.io quite frequently to modify geojson data sets, but there are some annoying bugs especially when working with larger data sets. One key feature they have is being able to swap between multiple tile providers, so you can compare where certain features are positioned on different maps.

I recently started a new Geo meetup here in Tokyo, https://GeoTokyo.com - I'll share at the next event.

Thanks