Pretty cool but when you are dragging a country to the planet the country is behind the planet which means I don't expect the drop to work. It should go in front and probably the planet should give some indication that the drag should work.

First time I looked at it I didn't find the country selector because that requires scrolling down.

It's not clear how to remove a country, though I do like it that I can change planets and see the same country. I'd consider turning the planet selector into a dropdown (maybe even on the planet window) which would let the country selector ride up and be more obvious.