I am trying to make my game respond to a command using my keyboard on my MAC. Here is what I have and it is giving me problems. I have the gravity down, but my character will not move if I press a button on my keyboard to command it.

using UnityEngine; using System.Collections;

public class NewBehaviourScript : MonoBehaviour {

 Vector3 velocity = Vector3.zero;
 public Vector3 gravity;
 public Vector3 flapVelocity;
 public float maxSpeed = 5f;
 public float forwardSpeed = 1f;

 bool didFlap = false;

 // Use this for initialization
 void Start () {
 
 }

 // Dographic and input updates here
 void update() {
     if(Input.GetKeyDown(KeyCode.Space) || Input.GetMouseButtonDown(0) ) {  
         didFlap = true;
     }
 }


 // Do physics engine update here
 void FixedUpdate () {
     velocity.x = forwardSpeed;
     velocity += gravity * Time.deltaTime;

     if (didFlap == true) {
         didFlap = false;
         if (velocity.y < 0)
             velocity.y = 0;
         
         velocity += flapVelocity;
     }

     velocity = Vector3.ClampMagnitude(velocity, maxSpeed);

     transform.position += velocity * Time.deltaTime;

     float angle = 0;
     if (velocity.y < 0) {
         angle = Mathf.Lerp (0, -90, -velocity.y / maxSpeed);
     }

     transform.rotation = Quaternion.Euler (0, 0, angle);
 }

}