Time.timeScaleの値をスライダーでいじれるようにするスクリプト

TimeScaleSlider.cs

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

public class TimeScaleSlider : MonoBehaviour
{
    [SerializeField, Range(0.0f, 2.0f)] float Time = 1.0f;

    private void Update()
    {
        UnityEngine.Time.timeScale = Time;
    }
}