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https://gyazo.com/176e966356e8c57db0dcdc088787535c

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using UnityEngine;

public class ChangeColorOnHit : MonoBehaviour
{
    //Hierarchy¤«¤é¥«¥é¡¼¤ò¥»¥Ã¥È¤¹¤ë¤¿¤á¤ËÇÛÎó¤òÍÑ°Õ¤¹¤ë
    public Color[] blockColors;

    /// <summary>
    /// ¥Ö¥í¥Ã¥¯¤Î¿§¤òÊѹ¹¤¹¤ë¥á¥½¥Ã¥É¡£ÇÛÎó¤ÎSize¤Ç»ØÄꤷ¤¿¿ô¤¬¡¢¿§¤ÎÊѤï¤ë½çÈÖ¤ÈÆâÍƤˤʤë
    /// </summary>
    /// <param name="index">¥Ö¥í¥Ã¥¯¤Î»Ä¤ê¤ÎHP</param>
    /// <returns></returns>
    public Color ChangeMaterialColor(int index) {
        //  index¤Ï [Block¤Îhp - 1]¤ÎÃͤòÍøÍѤ¹¤ë
        index--;
        //  ¥Ö¥í¥Ã¥¯¤Î¿§¤òÇÛÎó¤ËÅÐÏ¿¤µ¤ì¤Æ¤¤¤ëIndex¤Î¿§¤ËÊѹ¹¤¹¤ë
        return blockColors[index];
    }
}

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³¤¤¤Æ¡¢Destroyer.cs¤Î²¼µ­¤Î¾ì½ê¤ËÊѹ¹¤ò²Ã¤¨¤Þ¤¹¡£

public class Destroyer : MonoBehaviour {

¡¡¡¡(Ãæά)

///* Àë¸À¥Õ¥£¡¼¥ë¥É¤Ë2¤ÄÊÑ¿ô¤òÄɲà *///

    public Renderer rend;         ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡// ¥Ö¥í¥Ã¥¯¤Î¿§¤ÎÊѹ¹ÍÑ
    private ChangeColorOnHit changeColorOnHit;    // ¿§¤òÊѹ¹¤¹¤ë¥¯¥é¥¹¤Î¾ðÊó¤òÂåÆþ¤¹¤ëÊÑ¿ô

    void Start()
    {
        //Box¤ÎÂѵ×ÎϤò½é´ü²½(¸½ºßÃÍ¡áºÇÂçÃͤˤ¹¤ë)
        this.currentHp = initHp;

///* ¤³¤³¤«¤éÄɲà *///

        // masterObj¤Î»ý¤Ã¤Æ¤¤¤ëChangeColorOnHit¥³¥ó¥Ý¡¼¥Í¥ó¥È¤ò¼èÆÀ¤·¤ÆÊÑ¿ô¤ËÂåÆþ¤·¤Æ»²¾ÈÍøÍѤǤ­¤ë¤è¤¦¤Ë¤¹¤ë
        changeColorOnHit = masterObj.GetComponent<ChangeColorOnHit>();

        // ¥Ö¥í¥Ã¥¯¤Î¿§¤ò»Ä¤ê¤ÎÂѵ×ÎϤ˹ç¤ï¤»¤ÆÊѹ¹¤¹¤ë(ChangeColorOnHit¥¯¥é¥¹¤ÎChangeMaterialColor¥á¥½¥Ã¥É¤ÎÌá¤êÃͤȤ·¤ÆColor¤ò¤â¤é¤¦)
        rend.material.color = changeColorOnHit.ChangeMaterialColor(currentHp);

///* ¤³¤³¤Þ¤Ç *///

    }

    private void OnCollisionEnter(Collision collision)
    {
        (Ãæά)

        //  ¤Þ¤À²õ¤ì¤Ê¤¤¾ì¹ç
        else
        {
            //  ¥Ü¡¼¥ë¤òÄ·¤ÍÊÖ¤¹SE¤òºÆÀ¸
            AudioSource.PlayClipAtPoint(hitSE, transform.position); 

            // ¥Ö¥í¥Ã¥¯¤Î¿§¤òÊѹ¹      // <= ÄɲÃ
            ChangeBlockColor();        // <= ÄɲÃ
        }                                                               
    }

///* ¤³¤³¤«¤é¥á¥½¥Ã¥É¤ò£±¤ÄÄɲà *///

¡¡  /// <summary>
    /// ¥Ö¥í¥Ã¥¯¤Î¿§¤ò»Ä¤ê¤ÎÂѵ×ÎϤ˹ç¤ï¤»¤ÆÊѹ¹¤¹¤ë
    /// ChangeColorOnHit¥¯¥é¥¹¤ÎChangeMaterialColor¥á¥½¥Ã¥É¤Ë¸½ºß¤ÎÂѵ×ÎϤÎÃͤòÅϤ·¡¢Ìá¤êÃͤȤ·¤ÆColor(¿§¤Î¾ðÊó)¤ò¤â¤é¤¦
    /// </summary>
    private void ChangeBlockColor() {
        rend.material.color = changeColorOnHit.ChangeMaterialColor(currentHp);
    }

///* ¤³¤³¤Þ¤Ç *///

}

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