Critique of SMPS layout
I've looked at it for 10 minutes, and it doesn't look too bad.  It's good that there is a recommended layout and you've found it.  


Put C32 vertically between C18 and the regulator.  
I would put the the feedback network above the regulator, rather than below.  it would be shorter.  Also, you'll have easier time keeping it in the top layer.  (Recommended layout diagram has the feedback network routed above the controller too.)