While the game is definitely fun and challenging overall, a few puzzles are over the top frustrating which costs it a star. These levels are easy to solve conceptually (i.e. after a few tries you know exactly what you need to do) but when it comes to the mechanics of completing them they end up requiring such precise tapping as to become rage inducing. Specifically, levels 36, 59 and to a lesser extent, 57 like this, and these few levels made me want to uninstall the game rather than finish it.
Donkbro about Magnetized