The main issue for me was how candy move around one another, more specifically the candy corn. Everything else is round so it make it easy to predict how it will impact the rest of the candies movement, but the candy corn has corners and it doesn't act the way you think it should. And because it has corners, it tends to create spaces that make it difficult for the player to get access to again and if it gets put in a weird position, then it becomes hard to merge the candies between it.