I will admit, I did not think of the possibility of a seizure while I was making this game. However, the possibility would seem rather slim: photosensitive seizures are very rarely caused by changes in colour alone (brightness is usually the problem), and usually takes a quick flash to do so. The game doesn't have flashes, and only changes the hue and not the luminance.
I doubt there will be a problem, but there's always a possibility. More likely I guess it may cause you to get a bit dizzy.