I'm having the issue others have had where the blackscreen appears/the game crashes after the fight with Caleb in chapter 4. I have tried both web browser and downloading the game, and even after restarting and replaying, I still can't play past the fight. I can't unlock chapter 5 either. :( pls fix!
I actually ended up getting it to work! It took a few tries but maybe it was just being weird. It would turn into a fully black screen and sometimes would have the music playing.
I am using FireFox as a browser and a Windows system. Occasionally, I will get this message when playing on browser, however!