I think this just recognizes your gestures (i.e. it does not recognize shapes you draw). I added an example of a clockwise triangle (using the site's "Add as example of existing type") and it was then able to recognize clockwise triangles.

Sam here. The direction/ordering of the stroke seems important, I wonder why?

They could 'fix' this by adding reverse forms of each of the strokes. I wonder why they haven't? Does doing so drastically reduce the detection accuracy?