Is there a way to repair a scratched glass?

"Sadly your only real option here is to replace the watches crystal (cover glass).

Deep scratches require too much polishing to remove and often weaken the glass (thiner) and in the case of smart watches the imbedded touch screens can be damaged as well in the process of polishing."

"What is a good way to repair scratches on the glass?

Check that out, it might give you some options on things to try"