Updated sprites and pet logic

assets/pets/index.js

@@ -1,9 +1,12 @@
 'use strict';
 
 const cat = require('./cat');
+const maple = require('./maple');
 
 const PET_ASSETS = {
-  cat
+  cat: maple,
+  maple,
+  legacyCat: cat
 };
 
 function getPetAsset(type) {