My tap tap game - facing touch response issues

Hello.

I have made a tap tap jump kind of game for mobile devices . Recently I am getting a lot of bad reviews stating that the game touch controls are not responsive enough . I am sharing my code here (which I believe is flawlesssly near perfect) . Touch response is very critical in this game (a matter of life and death) for the game character . Also my game 2D and runs at solid 400+fps .

 void Update(){
 
         if (!isDead) {
             DetectTap();
 
         }
 }
 
 public void DetectTap(){
 
     
         //detect single tap
         if (Input.touchCount == 1) {
 
                         if (Input.GetTouch(0).tapCount == 1) {
                                 if (grounded) 
                                         jumpCommand = true;
                                         //jump ();
                         } else if (Input.GetTouch(0).tapCount == 2) {
                                 if (!hasDoubleJumped && !grounded){
                                         jumpCommand  = false;
                                         doubleJumpCommand = true;
                                     }
                         }
                 }
     
     }
 
 
 

UPDATE - - The game runs on 400 to 800 fps in Unity Editor - My bad - It might be running at lower fps on mobile devices

• Also below I have attached the complete PlayerScript.cs

  public class PlayerScript : MonoBehaviour {

     /*
        * 1.Default player motion move forward
        * 2.Single tap jump player
        * 3.Double tap double jump player
        * 4.On collision with danger
        *  i.stop animation
        *  ii.stop game
        *  iii.change player sprite to dead
        * 
        * Animations:
        *  - default anim is freeze
        *  - running anim when game start
        *  - dead anim when hit with cactus
        */
   
       public TextMesh debugText;
       private bool grounded = true;
       private Animator dinoAnim;
   
       public int dinoSpeedStepper = 2;
       private AudioSource a;
       public AudioClip jumpAudio;
       public AudioClip fartAudio;
       public AudioClip deadClipAudio;
   
       public static bool isRestart = false;
   
           public static bool isDead = false;
       
   void getAudio(){
           a = this.GetComponent<AudioSource>();
           if (a == null)
                           debugText.text = "no audio source";
                   else
                           debugText.text = "got audio source";
       }
   
       void OnCollisionEnter2D(Collision2D other){
           //debugText.text = other.gameObject.name.ToString();
   
           if (other.gameObject.name.ToString().Equals("Ground")) {
               hasDoubleJumped = false;
   
               grounded = true; 
               dinoSpeedForward = 1f;
               dinoAnim.SetBool("jump",false);
               dinoAnim.SetBool("run",true);
           }
   
           if (other.gameObject.tag.ToString ().Equals ("Danger")) {
               //return;
               isDead = true;
               dinoSpeedForward = 0f;
               transform.position = Vector3.MoveTowards(transform.position
                                                        ,other.transform.position
                                                        ,.1f);
   
               transform.rigidbody2D.isKinematic = true;
               dinoAnim.SetBool("run",false);
               dinoAnim.SetBool("jump",false);
               dinoAnim.SetBool("dead",true);
   //            Handheld.Vibrate();
   
               a.PlayOneShot(deadClipAudio);
   
           }
                   
       }
   
   
   
   
       void Start(){
           isDead = false;
           debugText.text = "in debug mode";
           dinoAnim = this.gameObject.GetComponent<Animator>();
           getAudio();
       
       }
   
       
   
       
   
       void Update(){
   
           if (!isDead) {
               DetectTap();
   
           }
           
   #if UNITY_EDITOR
   
           if (Input.GetKeyDown(KeyCode.Space)) {
               if(isDead)
                   return;
               if(grounded)
               {
                   jumpCommand = true;
               }else{
                   jumpCommand  = false;
                   doubleJumpCommand = true;
   
               }
           }
   
   
   #endif
   
   
       
       }
   
       public bool jumpCommand = false;
       public bool doubleJumpCommand = false;
   
       void FixedUpdate(){
           MoveForward();
   
           if (jumpCommand) {
                           grounded = false;
                           jump ();
                           jumpCommand = false;
                   } else if (doubleJumpCommand) {
                           
                           doubleJump();
                           doubleJumpCommand = false;
                   }
   
   
       }
   
   
   
       
   
   
       private void doubleJump(){
   
           grounded = false;
           if(!hasDoubleJumped)
           {
               hasDoubleJumped = true;
               dinoSpeedForward = 1.4f;
           
               rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x,5.3f);
           }
       }
       
       private void jump(){
           grounded = false;
           dinoSpeedForward = 1.01f;
           
           rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x,5);
           a.PlayOneShot(jumpAudio,1f);
           dinoAnim.SetBool("jump",true);
           dinoAnim.SetBool("run",false);
       }
   
       public float dinoSpeedForward = 1f;
   
   
   
       public void MoveForward(){
   
           this.gameObject.transform.Translate (Vector3.right*Time.deltaTime*dinoSpeedForward*dinoSpeedStepper * 1.1f);
       }
   
   
   
       public void DetectTap(){
   
           if (Input.touchCount == 1) {
   
                           if (Input.GetTouch(0).tapCount == 1) {
                                   if (grounded) 
                                           jumpCommand = true;
                                           
                           } else if (Input.GetTouch(0).tapCount == 2) {
                                   if (!hasDoubleJumped && !grounded){
                                           jumpCommand  = false;
                                           doubleJumpCommand = true;
                                       }
                           }
                   }
       
       }
   
   
   
   }