Nothing at all? After hitting start game on the tile, an intro should be playing.
That shouldn't be happening. The in-game menu on my end should only be coming up when C is pressed. Otherwise, hitting X on title starts the intro for me. I can only guess this might have had something to do with how virtual keys handling were updated in the engine during development. I'm honestly not sure what is going on since my own local copy of what was uploaded doesn't have this behavior.