I'ts a great game. I love the mechanics.
The puzzles are great, I enjoyed finding the solutions.
However there is one that requires perfect timing, without any room for error, and I can't see myself completing that level at all.
(The one where you drop the box by activating the moving platform at the end of the level)
There is a bug where 1 click fires 2 hearts at a time. This obviously makes it difficult to activate switches.