Fix: save score, highScore

src/game/lib/session_storage_manager.js

@@ -35,4 +35,20 @@ class SessionStorageManager {
 		return sessionStorage.getItem("playingAppName");
 	}
 
+	// score
+	set score(value) {
+		sessionStorage.setItem("score", value);
+	}
+	get score() {
+		return sessionStorage.getItem("score");
+	}
+
+	// score
+	set highScore(value) {
+		sessionStorage.setItem("highScore", value);
+	}
+	get highScore() {
+		return sessionStorage.getItem("highScore");
+	}
+
 }