Как сделать переход на следующий уровень? Unity 2D

using UnityEngine;
using System.Collections;
 
public class Character : Unit
{
[SerializeField]
private int lives = 5;
 
public int Lives
{
    get { return lives; }
    set
    {
       if (value < 5) lives = value;
        livesBar.Refresh();
    }
}
private LivesBar livesBar;
 
[SerializeField]
private float speed = 3.0F;
[SerializeField]
private float jumpForce = 15.0F;
 
private bool isGrounded = false;
 
private Bullet bullet;
 
private CharState State
{
    get { return (CharState)animator.GetInteger("State"); }
    set { animator.SetInteger("State", (int)value); }
}
 
new private Rigidbody2D rigidbody;
private Animator animator;
private SpriteRenderer sprite;
 
private void Awake()
{
    livesBar = FindObjectOfType<LivesBar>();
    rigidbody = GetComponent<Rigidbody2D>();
    animator = GetComponent<Animator>();
    sprite = GetComponentInChildren<SpriteRenderer>();
 
    bullet = Resources.Load<Bullet>("Bullet");
}
 
private void FixedUpdate()
{
    CheckGround();
}
 
private void Update()
{
    if (isGrounded) State = CharState.Idle;
 
    if (Input.GetButtonDown("Fire1")) Shoot();
    if (Input.GetButton("Horizontal")) Run();
    if (isGrounded && Input.GetButtonDown("Jump")) Jump();
}
 
private void Run()
{
    Vector3 direction = transform.right * Input.GetAxis("Horizontal");
 
    transform.position = Vector3.MoveTowards(transform.position, transform.position + direction, speed * Time.deltaTime);
 
    sprite.flipX = direction.x < 0.0F;
 
    if (isGrounded) State = CharState.Run;
}
 
private void Jump()
{
    rigidbody.AddForce(transform.up * jumpForce, ForceMode2D.Impulse);
}
 
private void Shoot()
{
    Vector3 position = transform.position; position.y += 0.8F;
    Bullet newBullet = Instantiate(bullet, position, bullet.transform.rotation) as Bullet;
 
    newBullet.Parent = gameObject;
    newBullet.Direction = newBullet.transform.right * (sprite.flipX ? -1.0F : 1.0F);
}
 
public override void ReceiveDamage()
{
    Lives--;
 
    rigidbody.velocity = Vector3.zero;
    rigidbody.AddForce(transform.up * 8.0F, ForceMode2D.Impulse);
 
    Debug.Log(lives);
}
 
private void CheckGround()
{
    Collider2D[] colliders = Physics2D.OverlapCircleAll(transform.position, 0.3F);
 
    isGrounded = colliders.Length > 1;
 
    if (!isGrounded) State = CharState.Jump;
}
 
private void OnTriggerEnter2D(Collider2D collider)
{
 
    Bullet bullet = collider.gameObject.GetComponent<Bullet>();
    if (bullet && bullet.Parent != gameObject)
    {
        ReceiveDamage();
    }
}
}
 
public enum CharState
{
Idle,
Run,
Jump
}

void OnTriggerEnter2D(Collider2D other)
    {         
        if (other.tag == "NextLvl") 
        {            
            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex +1);
        }
    }

using UnityEngine.SceneManagement;