Refinement of a game on Unity.

I can inexpensively refine a game (for any platform (Android, IOS, Mac, Windows...)) on the Unity engine, language preferably C#. I can also optimize the game. I will do everything fast, with high quality and inexpensively. By refining I mean, for example, adding advertising or finishing generation, etc... I have been developing games on Unity3d C# for more than 3 years, I also program in Php C++ and pure C#. I will be glad of any inquiries, so write.