Left thumb moves (camera stays locked on your enemy) · A jumps Right thumb is the sword: swipe out to wind up, then back through the center to slash
or back to the center to thrust. Circle from below to the top, then in = overhead thrust. Tap = jab. Shield: hold the round button bottom-right. It splinters under blows; once it breaks you take the sword in both hands (more reach).
Desktop: WASD + Space, drag the mouse for the sword, Shift / E / right mouse = shield. P = debug.