Pretty cool and also pretty hard! I misunderstood the controls at first, I though holding down left or right would slowly rotate my boxer.
In case someone else is confused: Tap them to rotate your walking direction 90°(either left or right).
Thanks for your feedback and the hint, Gruhlum! That's incredibly helpful, as it tells me that the onscreen-"help" does not communicate the controls well enough. I'll look into this as soon as I get to it :-) Thanks, chris