The problem with the game is that the unity of the game normally works, the menu is shown and it is normally possible to play. But once installed on the phone, the game is not loaded at all and there is only a blue background that is at the very beginning when we create a project. I am asking for help and thanks for that!
Please provide what you tried already and describe your issue completely. It might be you have not added Scene in the Build Settings; if done, provide a complete description such as Screenshots, your code. What you think would be causing the problem? etc.