First boots are often the longest to load. If it takes longer than a minute, reload the page. If it doesn't load check your download speeds. If you can run Dota- you can easily run this game.
Try checking your browser's hardware acceleration settings. Also, this game does not run on Safari due to the browser's code, I can't do anything to bypass this.
This can be caused due to your Cache, try clearing it then restarting the game. Also, some countries might block the video streaming service I use to host the videos(GitHub Pages).
