I think main menu and other things are important even if they're "just exists". The idea of building the necessary "suspense" is something that the industry figured out since long ago. Which made me realized that just by having the main menu appeared for the players despite having nothing else, is way better than getting the players directly into the game scene. Just like how I did for my game, with only a single "play" button is already good enough to give the players the sense of "suspense".