ui environment changes, fix multiple inits

Assets/Scripts/StartUp.cs

@@ -0,0 +1,10 @@
+using UnityEngine;
+
+public class StartUp : MonoBehaviour
+{
+    // Start is called before the first frame update
+    void Start()
+    {
+        GameManager.Instance.Scene.Change("City",string.Empty);
+    }
+}