Player controller for a 2d platformer in unity

public class PlayerController: MonoBehavior {
  /* Data */
  public float movementSpeed;
  public float jumpForce;
  public float fallMultiplier = 2.5f;
  public float lowJumpMultiplier = 2f;
  public float groundCheckDistance;
  public float wallCheckDistance;
  public LayerMask groundLayer;
  public Transform groundCheck;
  public Transform wallCheck;
  public ParticleSystem dust;
  
  /* States */
  private bool isGrounded;
  private bool isTouchingWall;
  private bool isFacingRight = true;
  private bool isJumping;
  private bool isMoving;
  
  /* Components */
  private Rigidbody2D rigidbody;
  private Animator animator;
  private ParticleSystem dustClone;
  
  /* Methods */
  private void Start() {
    rigidbody = GetComponent<Rigidbody2D>();
    animator = GetComponent<Animator>();
  }
  
  private void Update() {
    isGrounded = Physics