[dbaupp]

I couldn't work out how to implement the extra 2 movement dimensions on a phone. Does JS support detecting 2 finger swipes (or something similar) in a sane way?

[matthewmacleod]

You can certainly grab the number of touches in an event - two-finger swipe might be interesting. MDN has quite a few examples: https://developer.mozilla.org/en-US/docs/Web/Guide/Events/To...

[dbaupp]

Very cool, thanks; I've added two-finger swipe for the extra two dimensions.

[truebosko]

You may want to check out Hammer.js (http://eightmedia.github.io/hammer.js/)

[iLoch]

You could separate the screen. Top half/bottom half.