I don’t know how this might apply to you since you are in Moscow, but normally you don’t need to register copyright as you own copyright of anything you create. What you do need to register is trademark, and that’s usually for things like your company name/logo and the game name.
You can register copyright, but it’s just an added layer of protection and not a requirement. Though again, it might be a different case for you since you’re in a different country.