Jared Bailey of developer Nocanwin has confirmed to Joystiq that Fist Face Fight will be available on Thursday, April 18. Fist Face Fight will be a free download on both Android and iOS devices, ad-supported with in-app purchases of in-game currency. Any in-app purchase will disable advertisements permanently.
Fist Face Fight is a self-described "frenetic physics based arena combat game" in which you defend your heart by punching back waves of encroaching ninja. They want your heart; punch them.