Cool concept! The game feels a bit difficult but I feel like it's deserved, also the title screen is so cool! I would be interested in knowing how you achieved it :)
For the title screen, I got the mouse position x and normalised the values (0 - 255) to modulate the colour of the background and the sun. As for the parallax layers, I just changed the motion offset x for the grass layers based on the mouse position x.
