Mixed-reality (MR) platforms are moving toward controller-free input, relying on hand gestures and eye tracking. In this paper, we explore on-body micro-gestures as alternatives to MR gameplay via two implemented techniques - Palm and Knuckle - modeled on joystick steering and button tapping. We evaluated them with 24 participants, who played a third-person MR adventure game using the proposed techniques and a gaming controller. We found that the controller leads to the fastest and most precise performance. While Palm produced the most attacks and enemy kills and imposed the highest workload, Knuckle was rated the most enjoyable and socially acceptable in public. We demonstrate that although physical controllers are superior in speed and accuracy, on-body micro-gestures emerge as an appealing alternative/complement for casual or mobile MR play.