Currently we only have logic to scroll right to left (player moving left to right).
We will need to add more logic to handle scrolling in 4 directions.
Implement directional level scrolling and secret areas. Requirements:
– The level must scroll right, left, up, and down at least once per level.
– All collisions must work.
– Implement at least 1 secret area. The secret area is only visible if the player is at a
certain place at a certain time (see original game).
Diff: