Osu keypress code and really bad debouncing

const int buttonPin = 2;
int previousButtonState = HIGH;
void setup() {
  pinMode(buttonPin, INPUT);
  Keyboard.begin();
}
void loop() {
  int buttonState = digitalRead(buttonPin);
  if ((buttonState != previousButtonState)
      && (buttonState == HIGH)) {
    Keyboard.press('z');
    delay(80);
     Keyboard.release('z');
      }
  else{
  if ((buttonState != previousButtonState)
      && (buttonState == LOW)) {
Keyboard.release('z');
}

  previousButtonState = buttonState;
}
}