My main issue and It's probably already been mentioned but I'm struggling with the mouse look motion on HTML5 version. It's not as smooth / progressive as Flash even after playing with the sensitivity controls. It actually gives me a headache. Its a subtle noticeable difference but enough to put me off it. I keep trying HTML5 and I keep going back to Flash version which also has a more professional feel to it. Even though it (Flash ver) keeps erroring out on me (due to lack of support I assume)