This is a clean game, I didn't have much issues whatsoever.
But there are a couple issues.
I did not enjoy the fact the actual puzzle making didn't become more complicated, the lines of pieces just got longer.
Also, I was able to get to level 52...that is until the very last piece of the puzzle became glitched upon the stagnant piece.
If you're going to keep one set piece, you need to make it so the pieces are able to be transparent through it.
I do love the fact once it's in the right place the pieces turn darker, and the background is so simple as to not take away from the boldness of the object.