win/lose hold stats, hp crystal expiration

Assets/_Scripts/UIRingTimer.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class UIRingTimer : MonoBehaviour {
+
+	private bool initialized = false;
+	private float endTime;
+	private float length;
+
+	private Image ringImg;
+
+	private void Start()
+    {
+		ringImg = GetComponentInChildren<Image>();
+    }
+
+	public void Init(float timeInSeconds)
+    {
+		length = timeInSeconds;
+		endTime = Time.time + length;
+		initialized = true;
+    }
+	
+	void Update () {
+		if (!initialized)
+			return;
+
+		float amount = (endTime - Time.time) / length;
+		ringImg.fillAmount = Mathf.Clamp01(amount);
+	}
+}