Messy Code or Clean Code

I've been wondering for awhile now and haven't really considered how my code should look like. I've always just code the way I usually code and never really questioned whether this would be a mess to a professional programmer or not, so I ask this to you. Would you consider my coding mess or clean. If so improvements and tips are nice.

Here is an example of a script (Pretty Long and simple) The script works fine.

 using UnityEngine;
 using System.Collections;
 
 public class _Player : MonoBehaviour {
     private IRagePixel ragePixel;
      
     public enum WalkingState {Running=0, Slide, Jump};
     public WalkingState state = WalkingState.Running;
 
     public float speed = 6.0f;
     public float jumpSpeed = 8.0f;
     public float gravity = 20.0f;
     
     public GameObject respawn;
     
     public Transform arrow;
     
     private Vector3 moveDirection = Vector3.zero;
     
     private bool isJumping;
     private bool isSliding = false;
     private bool isRunning = false;
     private bool canShoot = true;
     private bool doubleJump = false;
     
     
     
 
     void Start () {
         ragePixel = GetComponent<RagePixelSprite>();
     }
 
     void Update () {
         
         CharacterController controller = GetComponent<CharacterController>();
         if (controller.isGrounded) {
             doubleJump=false;
             isJumping=false;
             moveDirection = new Vector3(speed, Input.GetAxis("Vertical"), 0);
             moveDirection = transform.TransformDirection(moveDirection);
             moveDirection *= speed;
             if (Input.GetButton("Jump")){
                 doubleJump=true;
                 moveDirection.y = jumpSpeed;
             }
             
         }
         moveDirection.y -= gravity * Time.deltaTime;
         controller.Move(moveDirection * Time.deltaTime);
         
         
         if(!controller.isGrounded&&isJumping){
             state = WalkingState.Jump;
             ragePixel.PlayNamedAnimation("jump",false);
         }
         if (Input.GetKey(KeyCode.Space)&&!isSliding&&canShoot){
             Instantiate(arrow,transform.position,transform.rotation);
             canShoot=false;
             StartCoroutine("Shoot");
         }
         if (Input.GetKey(KeyCode.UpArrow))
         {
             doubleJump=true;
             isJumping=true;
             state = WalkingState.Jump;
         }
         else if (Input.GetKey(KeyCode.DownArrow)&&controller.isGrounded)
         {
             isRunning=false;
             if(!isSliding){
                 controller.radius = 9;
                 controller.height = 5;
                 controller.center = new Vector3(23,-23,0);
                 isSliding=true;
             }
             
             state = WalkingState.Slide;
         }
         else
         {
             if(!isJumping){
                 if(!isRunning){
                     controller.radius = 6;
                     controller.height = 64;
                     controller.center = new Vector3(0,0,0);
                     isRunning = true;
                 }
                     isSliding=false;
                       state = WalkingState.Running;
             }
         }
         switch (state)
         {
             case(WalkingState.Running):
                 ragePixel.PlayNamedAnimation("run", false);
                 break;
 
             case (WalkingState.Jump):
                 ragePixel.PlayNamedAnimation("jump", false);
                 break;
 
             case (WalkingState.Slide):
                 ragePixel.PlayNamedAnimation("slide", false);
                 break;
         }
 }
     
     void OnTriggerEnter(Collider other){
         if(other.gameObject.tag=="hazard"){
             this.transform.position = respawn.transform.position;
             
         }
     }
     
     IEnumerator Shoot(){
         
         yield return new WaitForSeconds(1f);
         canShoot=true;
         
     }
 
 }