The UI is not centered. You need to anchor the UI and restrict it to a certain resolution. The best one I can recommend is 1280x720 for any Webgl game.
Meaning when I load up the game the UI part of the game and the character are off centre and I can't see the UI correctly or where I am moving to. Possibly u haven't set the Webgl build to a certain screen size and if it's 1920x1080 its too big for the size your got in the windowed view port.
