build me a game

I need a game developer who can make following changes in my hyper casual game. I want the following changes: 1) Change the admob ids and make some changes in ad formats. 2) Add in app purchases 3) Make minor graphics changes like colours change and all. 4) Different gameplay modes(easy, medium & hard) write I am a game customisor on top of your offer to be considered. 5) inviting friends and adding friends with a unique player id. 6) Leader board as in subway surfers, that also shows while Playing the game. 7) Gems that can help users revive themselves 8) A admin panel so I can give free gems to anyone through the unique player id. 9) Prepare the aab and ipa files so I can publish the game on the stores for android, iphone and ipad. Looking for experienced Unity developers for the work.