Looks really good!
Great progress. I guess you'll refine it's look and feel a bit more, but one thing:
is it possible to auto-save the changes instead of clicking the save button that appears? I see that it's going to get pretty repetitive. But so far, it looks really nice and smooth to use!
- circles for the + buttons?
- if there's the big add button, why is there the 'add trigger/action' at the bottom of the list?
- despite what i said before, i think column titles would be good
- maybe add some triangles that show what the column is referring to. They give us more context about what we're editing. (see my mockup below, there's a triangle pointing to the current selection which connects that to the column)
But, as usual, function before form. I guess just get the whole thing working before tweaking with aesthetics!