Holding the Wii Remote vertically and pressing and holding the A button until you are done Concentrating will let you restore a certain amount of Energy and Missiles.
After an enemy take however much damage, they will slouch on the ground or do something like it and won't attack. If they are downed, charge your charge beam fully and rush at them. You will perform a Lethal Strike, usually killing the enemy, depending on what it is.
When fighting Phantoon, don't wait for him to break the windows, because your Plasma Beam can go through the glass and into him. Charge up and fire! Or, while he is trying to break the window, charge up your Super Missile and when the glass breaks, fire! This can be tricky though, because you have to dodge. Shake your Wii Remote while charging up your Super Missile while an enemy is by you and you can dodge it, or SenseMove, out of the way.
Instead of rapidly tapping to use the Screw Attack, jump and wait for a few seconds, and then press it again. Tapping continuously will make you drop, while tapping at a more even pace will keep you in the air longer.
If you begin your charge beam, using sensemove successfully will bring you to full charge instantly! Especially useful in crowds in which you can dodge multiple foes and let the diffusion beam take them all out.
Sometimes when you do a lethal strike, You see a rainbow for about 2 seconds!