I did left click and did see things in the sky move around, but doing as you said, clicking to create a line between the different flowers doesn't seem to do anything. I think I've done as you said, left click to draw a line between flowers. But if I click outside of the flowers and drag a line through, or click on the flowers to draw a line through, holding the mouse down the whole time, does not seem to produce any changes to the flowers.
Here's a YT link of what I see. YT