Hello! Some of my testers also reported this problem trying to play my game. I am using godot game engine for my game and I been researching this issue. I know that it should work for Chrome, as I tried it on my phone, my own personal computer, and another computer to verify the issue. Bing for what I see (by extension IE) does not work fully. Safari doesnt either. From what I gathered, its most likely a javascript error in the code and/or incompatibilities. https://codeburst.io/uncaught-typeerror-cannot-read-property-of-undefined-in-javascript-c81e00f4a5e3 for my reference. I not sure it is full helpful, but this is the best I have at this time. If I find out more issues or fix the problem, Ill post again on this forum.