Oh man, this is a rough one for me, as I really, really, really want to love it! The game is just so incredibly juicy and polished in many respects, absolutely bursting at the seams with style, animation, and life. But man, I just had so much trouble with this game and it left a really sour taste in my mouth.
My biggest annoyance with this game was the physics. Say the screen is scrolling right, and you jump straight up: logically, you should expect yourself to go up and land in the same place where you were standing at the start. For some reason, though, this game has you move with the scrolling when you're airborne, which is completely unintuitive and threw me off constantly, making the precision jumps that this game requires impossible. It's just so silly and it's like there's some sort of wind blowing with the scrolling: if you jump with the scrolling, you fly across the screen, yet if you jump against the scrolling, you barely move forward at all.
In addition to that, I think the game's beautiful and colorful graphics actually work against it, as the screen devolves into a visual mess. Along with the busy background moving around, when you combine all the enemies, candies, symbols and player flying around every which way, there were loads of times that I lost myself, or would hit a small fly that I thought was a candy piece, and so on. Definitely needs to be some way to make critical elements pop into the forefront more and be distinguishable.
In addition, the game just felt really hard straight out of the gate, even playing on the normal difficulty. Part of it was caused by things being difficult to distinguish and the physics being so unintuitive, but I also think that part of it was just how many enemies are flying around (both not only in large quantities, but in large variety) without having some easy levels to ease you into things. If I were to guess, I'd say it's a classic case of the developer being the only playtester and getting too used to their game, cranking it to be way too hard by mistake.
There were also other quibbles like how I was always annoyed when the level transitioned the scrolling to be upwards suddenly: without having any platforms for you to jump up with, you always had to awkwardly fall down and reappear on top, almost always hitting an enemy that you have no chance of seeing in time.