The nunchuck joystick controls the direction you look in.
Pointing the wiimote aims the weapon selected.
Pulling the B button trigger on the wiimote fires the weapon.
Pressing the A button on the wiimote switches between the primary and secondary weapons.Pressing the 1 button puts more enemies in the queue - good if you want to see more enemies right away ( they will still queue up and be released slowly according to the stage, but there won't be a lull between waves, just a constant stream of enemies until the queue is emptied ). This was intended mostly for debugging and playtesting.
From the paused screen you can press + or - to switch screens.
There are 4 screens with different options:
The debug menu