Instead of clicking rapidly, tap the keys to write exactly the name of each enemy approaching, as well as Reload for whenever the weapon runs out of bullets.
Type your bonus name to active it:
“SHIELD” to protect yourself with barrels" (Appears when you shoot a bandit out of his horse),
“HYDROMEL” to recover your life (Appears after each wave of ennemies).
Don’t shoot innocents or you will lose a life and 50$!