Unity 2D Player Controller

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    //Components
    private Rigidbody2D rb;
    private Animator animator;
    private SpriteRenderer spriteRenderer;

    private float horizontalAxis;

    [SerializeField]
    private float moveSpeed;
    [SerializeField]
    private float jumpForce;
    [SerializeField]
    private int jumpCount;
    [SerializeField]
    private int maxJumpCount;
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        //Get components
        rb = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();
        spriteRenderer = GetComponent<SpriteRenderer>();

        //Default values
        jumpCount = 0;
    }

    // Update is called once per frame
    void Update()
    {
        ControlsUpdate();
    }

    private void FixedUpdate()
    {
        ControlsFixedUpdate();
    }

    private void ControlsUpdate()
    {
        //Get horizontal axis (horizontal movement direction) (-1 if A is pressed, 0 when nothing is pressed, 1 when D is pressed
        horizontalAxis = Input.GetAxis("Horizontal");
        //If player is moving
        if (horizontalAxis != 0)
        {
            //Enable running animation
            animator.SetBool("isRunning", true);
            //Flip sprite
            if (horizontalAxis > 0 && !spriteRenderer.flipX)
                spriteRenderer.flipX = true;
            else if (horizontalAxis < 0 && spriteRenderer.flipX)
                spriteRenderer.flipX = false;
        }
        //If player is not moving, disable running animation
        else
            animator.SetBool("isRunning", false);

        //If player can jump
        if (jumpCount < maxJumpCount)
        {
            //Check if jump keys are pressed
            if (Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.Space))
            {
                //Modify liniear velocity (Y axis)
                rb.linearVelocityY = jumpForce;
                //For older versions of Unity
                //rb.velocity = new Vector2(rb.velocity.x,jumpForce);


                //Increase jumpCount by 1
                jumpCount++;
                //Enable jumping animation
                animator.SetInteger("jumpCount", jumpCount);
            }
        }

    }

    private void ControlsFixedUpdate()
    {
        rb.linearVelocityX = moveSpeed * horizontalAxis;
        //For old Unity
        //rb.velocity = new Vector2(moveSpeed * horizontalAxis, rb.velocity.y)
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        //Reset jump count on collision with platforms
        if (collision.collider.CompareTag("Platform"))
        {
            jumpCount = 0;
            animator.SetInteger("jumpCount", jumpCount);
        }
    }
}