I lost mouse focus a couple of times by moving the pointer out of the browser window in the HTML5 version which lead to multiple game deaths. This didn't happen with the flash version. Is there some technical barrier in browsers preventing complete mouse capturing?
Animating scrollTop is quite a common effect that some developers/designers add (personally I'm not a fan).
Usually it's done using the jQuery animate function, meaning you can't take advantage of CSS transitions.
As you can't add a CSS transition onto the window scroll, this demo is useful as it shows a workaround that achieves the same effect using CSS transitions.
That's actually a much better sounding idea than just fragmenting the source into a whole new project, that will probably eventually suffer from disregard as Bootstrap continues to flourish.
Not a good practice. If you keep changes of .less files separate you create an overhead of 50-100% of the resulting style-sheet file size for larger projects, that style most of the components.
We now directly modify everything and try to merge in updates manually. This has proven to be the best practice.