Objective: Defeat as many enemies as you can.  Bounce on their heads, slice through them by aiming and attacking when the red aim is visible, and fly through them by aiming and attacking when the yellow aim is visible.  Recharge attack ability by bouncing on enemies.
Keyboard Controls:
Move with WSAD or the arrow keys, aim with mouse, attack with left click.
Gamepad Controls:
Move and aim with left stick or D-pad attack with ‘b’ (on Nintendo-style controllers).