My camera flies up when I shoot and can only be returned back by pressing escape
That's strange, what browser are you using? Were you playing with a mouse or a touchpad?
Waterfox, mouse
I just tried it on Waterfox and it worked fine, this seems like an issue on your end. Could you please try again? Here is a video of me beating the boss on Waterfox:
Hmmm, I'll try again.
