Enjoy this feeling. In my experience it lasts for just about one afternoon ;-). You'll just get used to your new self for which it's a normal thing it created this icon.
Sure do :)
As I think we're done design-wise, could you please modify this pull request so there's just a single commit containing all the changes? I also think that the png inside macos-icon-design is unnecessary (can be easily created from the svg by anyone) and doesn't have to be committed.
I've had some trouble squashing the commits into one. GitHub itself does have a squash and merge button can you please use that?