Build an Android Virtual World Game App (flat-image based)

Hello Developers! We are in need of an Android App game being coded. We are happy to do most of the imagery, but will possibly need help with layout and GUI also. The game will be based on a virtual world using flat-images where the user clicks a map or icon or image to move around to a different location in the virtual world or to a different screen. So it's not 2D or 3D, just uses flat images. Please send examples of previous android app work when bidding. The App will need to include the following features: - User Registration / Login using Google Play accounts, possibly Facebook integration too. - Inventory System: The user can receive, collect or buy items which will then appear on their inventory screen. Some items in the inventory can be clicked on with an action, such as food can be clicked on, then a menu appears to eat it. - Pet System: Users can create a pet and name it. The pet will have its own stats and can have weapons/armor added to the pet's inventory. - Pet Battle: Users can battle their pets against AI enemy pets in a 1 vs 1 battle (like Pokemon battle system) and even other online players. - AI Shops: Multiple AI run shops selling different items and the current items in the shop shown to all players viewing that shop (so all users see the same items for sale). - User Shops: Users can create their own shop, add items from their inventory to it. There should be a user shop search function where users can search an item name and it brings up a list of player shops who are selling that item. - Auction House: Live auction house to sell items at auction style. - Mini Games: 3 or 4 mini games where users can play to earn virtual currency such as Snake, Simple Puzzle, Card Games etc - Various other locations around the world for the user to visit. - Private Messaging and Friend System - Guild/Group System - Database integration to save user data. All inventory, shop data needs to be server sided to prevent app hacking. - Web Admin Panel: View users, user activity logging, ability to import new items into the AI shops. - Admin should be able to add new items into the game/database without the need for the user to have to update their game apk. - Google Shop Integration: Integrate a section where users can buy in-game items for real money. - Video Ad Integration - Secure coding throughout and with the database connection to prevent hacking or the use of cheat engine software. - Submission to Google Play Store Coder/Team must be available to add more features in the future at extra cost.