Hi, this collision script is wrong pls help?

Unity Engine
, ,
1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class Collisione : MonoBehaviour
{
    public GameManager gameManager;
    public GameObject NemiciRossi;
    // Start is called before the first frame update
    void Start()
    {

    }
    private void OnCollisionEnter(Collision other)
    {    //distruggo nemico blu con player
        if (other.gameObject.tag == "PuntiBlu")
        {
            Destroy(other.gameObject);

            //assegno la posizione al nemico rosso
            float asseX = Random.Range(-15f, 15f);
            float asseZ = Random.Range(-15f, 15f);

            //instanzio nemico rosso 
            Instantiate(NemiciRossi);
            NemiciRossi.transform.position = new Vector3(asseX, 1, asseZ);
            gameManager.NemiciRimasti();
        }
        //distruggo il player con nemico rosso
        if (other.gameObject.tag == "NemiciRossi")
        {
            Destroy(gameObject);

            //nemicirimasti di gamemanager si incrementa di uno 
            gameManager.NemiciRimasti();

            SceneManager.LoadScene("Fine");
        }
       
    }
}
2

I have no idea why, but it worked for me after adding a Rigidbody to the Player.

3

If you want to stop the Player from falling over if you have a Rigidbody attached, you can use the Constrains, located in the Rigidbody component and freeze the x and z rotation.