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More especifically, it's ok as far as the screen is rendering one single (maybe static) "something", say a full color background or a not moving picture maybe, the thing is it must always be able to tell that it is in one state or the other, not both nor mixed states. That's why we first think of just two full colors, but as it was asked in another thread, i think it's ok to use some animations if you can make the animations be quite distinct to each other and to stop one and switch to the other one cleanly so the above stated holds.

Greetings, MG_.

IMHO, limited to two distinct colors shading to their lighter ones is ok as far as the speed of shading is constant for both colors and there is no common color between them so the player don't get confused about what color/state is being showed. Also, the shading animation may take shorter time than the amount of time needed to change to the other color, being this the case you should keep the lighter color in a static fashion or maybe loop the animation (putting back the darker tone of that color and shading again or maybe shading back to the darker tone) but i am not sure if the latter follows the rules of the jam :/.

Greets.