Unityでゲージの減少を行うための処理

GageDecreasing.cs

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

public class GuageDecreasing : MonoBehaviour {

    public GameObject Guage;

    private float guageMax;
    private float guageNow;
    private float width;
    public float restGuage{ get { return guageNow; } set { guageNow = value; } }

    void Start () {
        guageMax = Mathf.Clamp(guageNow,0, guageMax);
        guageMax = 5;
        guageNow = guageMax;
        width = 1150;
    }
    
    public void Decreasing()
    {
        guageNow -= Time.deltaTime;
        guage.GetComponent<RectTransform>().sizeDelta = new Vector2(width * (guageNow/ guageMax), guage.GetComponent<RectTransform>().sizeDelta.y);
    }
}