Main menu design for mobile

I’ve been working on a mobile runner game that has a silhuette style design. Now I’m at the main menu concept and creation and it looks fair enough, the composition certainly suits the game. One concern though - it is realistic and looks way better than the game itself. As it will be a video in the main menu, it won’t cause any performance issues at all.
Do you think it is a mistake to make a main menu like I said for a game I said?
Thanks in advance.