Doesn't seem to work well in Chrome on OS X. The scene is all green, with black rendering speckles accumulating all over. I can play for a few seconds, but can't see much after a little bit.
Worked well for me. It looks very very noisy for me though, much more so than the screenshots you have. Does it automatically scale the number of samples to get a playable frame rate?
Works great in Chrome 39. I can see the noise but it looks like part of the style and not distracting at all. I love how it creates fear! They come at you when your back is turned. Though I found you can just run backwards in a circle to consistently dodge them, at least got 88.9 seconds that way.
The result is bright bluish and a lot of noise. I can move around with WASD but unsure of what to do. Both Chrome and FF yield same result. Running Ubuntu with nvidia GT750m(proprietary driver).