I enjoyed this a lot. Simple concept, but it is fairly fun. Puzzles feel like they have a good difficulty, where they are easy enough to keep you going for just one more level, but challenging enough that they feel,... well, challenging.
Only thing that I felt was sometimes a bit annoying where the clickboxes and how to drag them into the right shapes. It could feel a bit smoother and it sometimes dragged out the gameplay a bit too much.