2D пинг-понг

using UnityEngine;
using System.Collections;
 
public class BallScript : MonoBehaviour 
{
 
    public static int EnemyScore {get; private set;}
    public static int PlayerScore {get; private set;}
 
    private float speed;
    private float factor;
    private System.Random random;
 
    void Start () 
    {
        BallScript.EnemyScore = 0;
        BallScript.PlayerScore = 0;
 
        this.random = new System.Random();
        this.speed = 15.0f; 
        this.factor = 30.0f;
        this.ReplaceBall(); 
    }
 
    void Update () 
    {
 
        var cvel = this.rigidbody2D.velocity;
        var tvel = cvel.normalized * this.speed;
        this.rigidbody2D.velocity = Vector2.Lerp(cvel, tvel, Time.deltaTime * this.factor);
    }
 
    void OnCollisionEnter2D(Collision2D collision)
    {
        var name = collision.gameObject.name;
        if(name.Equals("TopWall"))
        {
            BallScript.PlayerScore++;
            this.ReplaceBall();
            return;
        }
        else if(name.Equals("BottomWall"))
        {
            BallScript.EnemyScore++;
            this.ReplaceBall();
            return;
        }
        else
        {
            var force = (float)(this.random.NextDouble() * this.random.Next(-50, 50));
            this.rigidbody2D.AddForce(new Vector2(force, 0.0f));
        }
    }
 
    void ReplaceBall()
    {
        this.transform.position = new Vector2(0.0f, 0.0f);
        this.rigidbody2D.AddForce(new Vector2(-30.0f, 0.0f));
    }
 
}