Checkpoints don't work for me in Firefox, not sure what the issue is. It's too bad since this looks like a game I'd really like. I notice that https://v6p9d9t4.ssl.hwcdn.net/html/4823443/html5game/Save.ini is returning a 403 response with message "Anonymous caller does not have storage.objects.get access to the Google Cloud Storage object."
Edit: I was able to play the game in Safari but experienced lag/stuttering which became intolerable later on in the game. Not sure if that's the fault of the game or my browser or computer.
Outstanding game, just wish I could play it properly :/