https://developer.mozilla.org/en-US/docs/Web/API/PannerNode/setVelocity
Construct 2 uses this obselete API, which causes an error hence the game remains dark.. if you want to play the game you have to break point at line:16270 in c2runtime.js and when it is there you can ihit esc and type in the console context.listener.setVelocity=function(){}