ELKW was made for the Ludum Dare 30 Jam with the theme "connected worlds." I think it's fun to think about how small systems that interact with each other can form even bigger systems that can also interact with each other, i.e. cells make organs, organs make people, people make societies. ELKW is supposed to represent little worlds that exist within each other and the way you interact with the world determines how future worlds work.
In reality, I didn't have time to do all of that so there's some graphical cues to hint at it and the player's powers change depending on how he or she finishes each level. There are 12 powers in all. They're all thematically based on your choices.
Check out my Ludum Dare 30 page for spoilers about the different ways to complete each level and which combinations are my favorite.