It's me, but pixelated! Ish.
I was disappointed to find that I couldn't just make squares by making the row height and column width the same number. Apparently they don't use the same scale. So I kind of just eyeballed it and dragged the column width down until it looked pretty much like a square, and then I made all the other columns that width, too.
In case you're curious, it ended up being: Row Height = 14.4, Column Width = 2.