From what I saw in the promotional material for this game, I noticed one picture showcased nichelings with different pupil types (I've included the picture in this post for reference) . I was thinking that it would be a nice addition if nichelings could mutate different pupil types. It could either be purely aesthetic, like the nicheling's eye color, or the pupils could have some survival advantages. For example, the slit pupil gene could make sight better in darker biomes, like the swamp,