When aiming about 45 degrees to the left of the block grid, there is very noticeable zipper-like movement when moving in such a degree. It is less noticeable when the degree is less severe, but it is still present. Here is a GIF. Giphy
Or just open the latest version and recreate my comment, it is obvious...
Also, this is on version 1.2.2 as the game said when I launched but cannot select it...
If it helps the build is: 510650, Date: 2017-09-29.