Ring의 scale이 음수가 되지 않도록 수정

RhythmKata/Assets/Scripts/ForwardNoteObject.cs

@@ -74,7 +74,7 @@ public class ForwardNoteObject : NoteObject
     public override void SetPosition(float remainedTime)
     {
         base.SetPosition(remainedTime);
-        ring.localScale = (1 + 4 * remainedTime / maxRemainedTime) * new Vector3(1, 1, 1);
+        ring.localScale = Mathf.Max((1 + 4 * remainedTime / maxRemainedTime), 0) * new Vector3(1, 1, 1);
         
         // change ring alpha
         var img = ring.gameObject.GetComponent<UnityEngine.UI.Image>();