Wireless Nerf Gun Arduino

#include <Servo.h>

Servo panServo; Servo tiltServo; Servo fireServo;  // create servo object to control a servo

int tiltSpeed = 3; int panSpeed = 3;
int tiltPin = 10; int panPin = 9; int firePin = 8;
int tiltAngle; int panAngle; int fireAngle; //119~150
int command;

void setup() {
  Serial.begin(9600);
  panServo.attach(panPin);
  tiltServo.attach(tiltPin);
  fireServo.attach(firePin);
  tiltAngle=5; panAngle=5; fireAngle = 133;
  fireServo.write(fireAngle);
}

void loop() {
  command = Serial.read();

  if (command == 0){
       moveUp();
      }

  if (command == 1){
       moveDown();
      }

   if (command == 2){
       moveLeft();
      }

    if (command == 3){
       moveRight();
      }

    if (command == 4){
       shootGun();
      }

    tiltServo.write(tiltAngle);
    panServo.write(panAngle);
}

void moveUp(){
  if (tiltAngle < 180)
    tiltAngle+=tiltSpeed;
}

void moveDown(){
  if (tiltAngle > 0)
    tiltAngle-=tiltSpeed;
}

void moveLeft(){
  if (panAngle < 180)
    panAngle+=panSpeed;
}

void moveRight(){
  if (panAngle > 0)
    panAngle-=panSpeed;
}

void shootGun(){
  fireServo.write(150);
  delay(500);
  fireServo.write(133);
}