What browser are you using?
Win 10 and Chrome is what the game was developed on, so it may be issues with work-related restrictions, or an unsuitable Chrome version.
This is the line that errored, when canvas.getContext("webgl2") couldn’t get the context.
This table here details compatible browsers, which I will add to the page shortly. If you are on Chrome 56 or older (chrome://version/) then that is likely the issue.