I just finished it, and I'm glad I did before I came here and caught up with the thread 
There were two last pieces on World 6 that had me stuck for a while, but I had a couple of 'eureka' moments with both of them. Credit to the developer for never having any puzzles that required trial and error, because the solution is always there when you know how to look. Too many otherwise great puzzle games have fallen into that trap as a way to make things harder.
Anyway, ending talk from here on...

There were two last pieces on World 6 that had me stuck for a while, but I had a couple of 'eureka' moments with both of them. Credit to the developer for never having any puzzles that required trial and error, because the solution is always there when you know how to look. Too many otherwise great puzzle games have fallen into that trap as a way to make things harder.
Anyway, ending talk from here on...
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