Gamen3/Assets/Scripts/Terrain/OrbBehaviour.cs

using UnityEngine;

public class OrbBehaviour : MonoBehaviour
{

    private void OnTriggerEnter(Collider other)
    {
        if(other.gameObject.name == "Player")
        {
            GameObject.Find("GameManager").GetComponent<GameManager>().IncreaseScore();
            Destroy(gameObject);
        }
    }
}