Make some global objects const, at least

gorge.js

@@ -1,19 +1,18 @@
 "use strict";
 
-let belongings = {};
+const belongings = {};
 
-let ownedUpgrades = {};
-let remainingUpgrades = [];
+const ownedUpgrades = {};
+const remainingUpgrades = [];
 let showOwnedUpgrades = false;
 
-let effects = {};
+const effects = {};
 
-
-let resources = {};
+const resources = {};
 
 let updateRate = 60;
 
-let currentProductivity = {};
+const currentProductivity = {};
 let clickBonus = 0;
 let clickVictim = "micro";