Hello community 
I think that Hand Js not working on last version of google chrome mobile ...
I made some test and i finished by testing this website : http://www.catuhe.com/msdn/handjs/index.html ...
It draw a little line and stop without "touch end".
Thanks for your help,
Letsbro studio team.
@Deltakosh : I ping you because i see that you work on hand js 