fix game

src/App.jsx

@@ -191,9 +191,10 @@ export default function App() {
         // Only start timer on first damage
         if (!scoreTimerRef.current) {
           scoreEndRef.current = Date.now() + 20000;
+          let lastLeft = -1;
           const tick = () => {
             const left = Math.max(0, Math.ceil((scoreEndRef.current - Date.now()) / 1000));
-            setScoreTimeLeft(left);
+            if (left !== lastLeft) { lastLeft = left; setScoreTimeLeft(left); }
             if (left > 0) scoreRafRef.current = requestAnimationFrame(tick);
           };
           tick();