Good start but but needs a little improvement

Thank you very much! I want to use this every day. However I am having trouble with it:
When I turn my head to the left or right, or look down at the keyboard, Nekoze pops up, even though my back is upright.
This is not correct, the app should check the shoulder position only, I think. So maybe this needs a little improvement so I can move my head while working in front of the screen without triggering an alarm.
Thanks for your attention.

Dim X about Nekoze, v1.0