Sadly I can't say that I've played the other 2 games you've made in this series, but I can say that I enjoyed the 30 or so minutes I spent playing this. When you said 'most challenging' I drastically underestimated what you meant, and soon learned the wrath of this game. The levels were as hard as you said they were going to be, but I believe you went a little too fast with how difficult the game gets. I felt as though I was mentally being hit with a brick during the mid levels, though I was starting to relax my mind and let it flow with the insanity the drives people to complete this game.
Between mapping out the levels in my head and slowly feeling my brain melting I did take the time to notice the polish you put into this game, like how I saw the ball roll and the dots follow in place as if it were a real ball in the direction I told it to move, which included moving up and down, turning toward me while going up and away from me while rolling down. Comboed with good music and easy to learn controls and mechanics, this game is nothing short from 4 stars.