I posted some of this in the fight thread, but I wanted to add some positives!
I liked the hedge maze. I didn't have too many bug problems so I was good with it.
Really I liked the puzzles in general (and I played this on a newer computer so I enjoyed it more than previous chapters cause it ran better) This was the first one I didn't have to resort to a walkthrough due to computer issues so I had a nice time.
I liked the time reverse bits, I found it a nice touch and there is no reason for me to think on it too hard, its just fun

Small things: I took the wood to the termites expecting them to make me a horn, so imagine my shock when they made me a white king! There were a number of things I did "by accident", did that come up at all in beta or with others??
Agree with others the travel between islands got tedious.
LOVED the Isle of the Sacred Mountain!!!!
The episodic nature means that I forget things from last time, I assumed I had already read the poem book in the bookstore for a really long time. Its hard to remember what you tried, what you didn't, and what's different now. I really would like to avoid episodic stuff in the future.
Why the hell couldn't I just ask the Beast/Prince for the horn? I didn't go back and talk to him because I realized what I was supposed to do, was that addressed if I were to talk to him again?
Also I got frustrated that I couldn't directly address the muse playing the harp, trying to talk to just her got me her 2 annoying sisters. That stalled me for a LONG time!
Also, WE HAVE A GENIE! Why is everything so hard?

Where DID the actual white king go?
I thought the fact that the scepter/locket fight with the queens got emphasized meant I should be looking for a locket, and giving one of them them the baton, that threw me off for quite a while!
I have to BUILD a paintbrush when my comatose son has one just lying around?

I love the overarching story can't wait to see where it goes.
Was that the pumpkin house from KQ7 in the cutscene at the very beginning??? Cause that's awesome!
And as I and many others have stated, I HATED the last 2 sections. If I want to play an RPG, I will play an RPG. I didn't play QFG cause I didn't like those elements. And no, this was nothing like the ending sequence from KQ5, which as I have said, was a puzzle battle. And really, I have to assemble 12 zodiac signs?

There should be a puzzle about which 4 I need, then I assemble those 4. 12 is just stupid, and so is having the narrator in that puzzle. And no, I wasn't tense after it became obvious I wasn't on a timer and wasn't going to get killed.
And really Valanice? You should be prepared to sacrifice your own child for the sake of the world. The whole time I was being forced to open the Pandora's Box all I could think was, if you open this the world ends, so we all die anyway, why am I doing this?

?
Keep the puzzles semi logical and quit with the hand-eye coordinating arcade stuff, and I will LOVE LOVE LOVE episode 5.