I’ve got an idea!
Coming up with an decent implementable idea, which would not revolve around small island or planet was quite difficult. 24H left and I’ve spent my time so far by sleeping, eating, moving furniture and having family time while trying to think about the theme. Maybe I should’ve told to my family, that I’m participating LD#48, but that’s one sure way to me to not get anything done at all. Maybe next time, when I’ve made decision to participate a bit earlier than two days beforehand. Sofar I’ve got this:

Design for the game
Should be simple enough to be implemented in time. From a single particle’s view the world is infinite but from our perspective it’s miniscule. I got the idea from this cartoon. ( Sorry, couldn’t find the original author/source even with the signature on the top right corner. )

Inspiration
If I”d more artsy type I could use some twist like this “The Large Ego Collider”:
http://alexdriver.blogspot.com/2011/07/large-ego-collider.html
Anyways, your task is to survive and not cause another Big Bang!