Key Slinger

Slay enemies coming towards you using both your sword and gun. 

Sword(W, A. S, D): When an enemy is within the pink circle, press the key on your keyboard corresponding to the letter on top of the enemy to slice them in half at blinding speed. You can hit multiple enemies with the same key at once.

Gun(I, J, K, L): Press the key on your keyboard to the corresponding letter on top of the closest target (highlighted in yellow) to shoot your gun with pinpoint accuracy.

For each enemy you slay you gain a little bit of health back, however, press the wrong key and you will lose some health and be stunned for a short period of time.  If your health bar is depleted, you lose.

How long can you last?