I’m not sure what kind of browser or device you are using, so this might be a bug or a problem with that specific browser. After clicking “Start Game,” try entering developer mode in your browser by pressing F12 or CTRL + Shift + I. In the console tab, there might be an error message explaining what went wrong. If there is an error, you can report it on Discord or here so I can fix it.
If you don’t see any error messages in the browser’s developer mode, try changing your browser or using a different device. I know these are not ideal solutions, but without knowing the underlying problem, I can’t assist you further. Let me know about any progress.