You have a couple choices. First, you could make your level along the bottom of your layout and disable unbound scrolling so it can't exit. You could also have a small, invisible object that you set to follow the player (maybe at player.x, player.y+180) to make an offset and use scroll to to THAT object instead of the player.
Really, I'd use both and then get fancy and use lerp in how you set your invisible object's position to make it smooth.