Lovely! Very pretty and made the three-dimensional aspect totally readable, which is often a big challenge in perspective-based puzzlescripters.
I wonder if there's some more variety to be found in the puzzle design, either mechanically (see Stephen J. Miller's Omelettes) or just further exploring the interactions of the elements you've already got (eg pushing blocks on two levels, stacking blocks, etc) but only because all the other elements are A+ :)