Some players informed me that they cannot start the game because their browser throws an error.

If your browser (Firefox) gives you this Error:

"Apologies! A fatal error has occured. Aborting. Error: no valid storage adapters found."

This is most likely because your browser or an add-on doesn't accept third party cookies. The server hwcdn.net needs to set a cookie though, otherwise the game doesn't work. Unfortunately there is nothing I can do about it, so it's your choice if you want to allow that to be able to play the game. Or you can download the game (zip file with the html files) and play it offline.