this looks wonderful yet it does seem to be a little rushed. if you did have more time and take it a little slower and clean it up a li'l bit this would turn out remarkable.
i know, it's for the weekly challenge and thus you've only got limited time, but this looks way too rushed and needs lotta refinement
especially the unlovingly copy-and-pasted (and even worse: streched!) rocks are a total no-go!