Reaction Game for Arduino using LCD, LED, and Switch

reactionGame.ino

#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);
const int switchPin = 8; 
int switchStatus = LOW;
const int ledPin = 7;
int time = 0;
bool startPhase1 = false;
int randomStart = 0;
bool startPhase2 = false;
bool gameComplete = false;
bool hasWarned = false;

void setup() {
  pinMode(switchPin, INPUT);
  pinMode(ledPin, OUTPUT);
  resetGame();
}

void loop() {
  int currentTime = millis();
  switchStatus = digitalRead(switchPin);
  if ( gameComplete && 5000 <= currentTime - time ) {
    resetGame();
  } else if ( startPhase1 && !startPhase2 && !gameComplete && switchStatus == LOW && hasWarned ) {
    lcd.clear();
    hasWarned = false;
  } else if ( startPhase1 && !startPhase2 && !gameComplete && switchStatus == HIGH ) {
    if ( !hasWarned ) {
      lcd.clear();
      lcd.begin(16, 2);
      lcd.print( "Stop holding the" );
      lcd.setCursor(0,1);
      lcd.print( "button, cheater!" );
    }
    hasWarned = true;
    restartPhase1(currentTime);
    delay(500);
  } if ( startPhase1 && startPhase2 && !gameComplete && switchStatus == HIGH ) {
    lcd.clear();
    lcd.begin(16, 2);
    lcd.print( "Reaction Time:" );
    lcd.setCursor(0,1);
    float timeDiff = ( currentTime - time ) / 1000.00;
    lcd.print( String( String( timeDiff, 3 ) + " seconds" ) );
    gameComplete = true;
    time = currentTime;
  } else if ( startPhase1 && !startPhase2 && !gameComplete && randomStart <= ( currentTime - time ) ) {
    startPhase2 = true;
    digitalWrite(ledPin, HIGH);
    time = currentTime;
  } else if ( !startPhase1 && !startPhase2 && !gameComplete && switchStatus == HIGH ) {
    restartPhase1(currentTime);
    lcd.clear();
    delay(500);
  }
}

void restartPhase1(int currentTime) {
    startPhase1 = true;
    randomStart = random(1500, 5000);
    time = currentTime;
}

void resetGame() {
  digitalWrite(ledPin, LOW);
  lcd.clear();
  lcd.begin( 16, 2 );
  lcd.print("Push button");
  lcd.setCursor(0, 1);
  lcd.print("to start!");
  randomSeed(analogRead(0));
  startPhase1 = false;
  startPhase2 = false;
  gameComplete = false;
  hasWarned = false;
}