Regarding controls: with the dual analog sticks, did you then have arrow keys/mouse bound to the sticks for non-mobile browsers, and then touch for mobile browsers? How was that handled?
I just switched between these two control schemes, based on whether the browser supported the touch events.
There's a certain degree to which you could do this "automagically" - i.e. generate on-screen buttons based on the keyboard keys that are used in the game. But since controls are so important, I'd rather decide for myself on case by case basis how they translate to mobile.
http://www.phoboslab.org/log/2012/06/x-type-making-of