I like this puzzle mechanic although i wasnt sure what the rule determining when they actually spread out was, didnt seem concrete or well shown. The level design was really impressive though, it looks like you tried to fit the story into the levels (the goals spreading out or having walls in between) although that could just be me looking into it too much. One thing though, I almost missed the story text because i was focused in on the play area and didnt really notice it till a couple levels in