Cheese Roll 2.1 is out now!
In Cheese Jump, Light mode is a separate version of the game that is available for 1.1.5 and alpha. It makes everything but the Truckle white.
In Cheese Maze, there is an easter egg accessed through level 4, on slide 176, which is a settings menu that was "abandoned" (it wasn't actually, this is intentional). The only setting that works is turning on light mode. This brings you to a "broken" copy of the slide in which most of the things on the page are recolored to be white.
The purpose of these is to communicate that Light mode is stupid.
Reverse mode color: In cheese jump, Reverse mode only changes the colors of the Truckle.
History: Light mode was first created for version 1.1.5 and then for Alpha.
While making Cheese Maze, Ian added an easter egg that lets you turn on light mode.