Hey, thanks for playing our game and your feedback! It can be a bit confusing.
The left click changes the shape, think circle, diamond, or V. The right click changes the spacing. So, if you are on full spacing in circle mode, you'd see a full circle, but if you right click, the spacing drops by half and you get a half circle.
I think how that plays with the different shapes is something that needs some more tweaking for clarity.
