void OnTriggerEnter(Collider other)
    {
        if (other.tag == "Boundary")
        {
            return;
        }

        if (explosion != null)
        {
            Instantiate(explosion, transform.position, transform.rotation);
        }

        if (other.tag == "Player")
        {
            if (gameController.playerInvincible)
            {
                gameController.AddScore(scoreValue);
                Destroy(gameObject);
                return;
            }
            else
            {
                Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
                if (--gameController.playerLives <= 0)
                {
                    gameController.GameOver();
                }
                else
                {
                    gameController.Respawn();
                }
                gameController.livesText.text = "Lives: " + gameController.playerLives;
            }
        }

        gameController.AddScore(scoreValue);

        Destroy(other.gameObject);
        Destroy(gameObject);
    }