I tried again and my other gamepad with analog sticks (cheap brand) won't work at all none of 2 sticks. D-pad nor buttons, despite it works well in Firefox with my own game.
Maybe it is something with chrome because it works in firefox with my own C2 game.
The simpler (the one I prefer) game pad with D-pad works with the buttons only. (a Logitech model)
Well, I will wait for proper release then. I hope I will not forget it.