unity

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class move : MonoBehaviour
{
    public string startmsg = "Peli alkaa";
    public int spd = 69;
    public Rigidbody rb;
    private int Score = 0;
    public float turnspd;
    private GameObject canvas;
    private Text text;
    // Start is called before the first frame update
    void Start()
    {
        Debug.Log("Testi");
        canvas = GameObject.Find("Canvas");
        text = canvas.GetComponent<Text>();
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.LeftArrow)) { transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles.x, transform.rotation.eulerAngles.y - turnspd, transform.rotation.eulerAngles.z); }
        if (Input.GetKey(KeyCode.DownArrow)) { rb.AddRelativeForce(Vector3.back * spd); }
        if (Input.GetKey(KeyCode.RightArrow)) { transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles.x, transform.rotation.eulerAngles.y + turnspd, transform.rotation.eulerAngles.z); }
        if (Input.GetKey(KeyCode.UpArrow)) { rb.AddRelativeForce(Vector3.forward * spd); }
    }

    private void OnCollisionEnter(Collision collision)
    {
        if(collision.gameObject.tag == "Coin")
        {
            Score++;
            Destroy(collision.gameObject);
            text.text = "Coins: " + Score;
        }
    }

}