Not necessarily looking for DoS, I've liked all the handheld CVs in their own way (got into the series with the GBA launch, Ecclesia ended up my favorite).
I guess the biggest thing that got me and I'm curious as to whether or not it's representative of the final product was the boss battle at the end. I could see myself really getting into the boss battles potentially, but I just wasn't fond of a couple of things here. Like, do all of the bosses have a couple of checkpoints midbattle? That really felt bad to me. And are they filled with quicktime events? And while it was a smaller issue, do they all flash/blink/whatever to so blatantly telegraph their attacks?
Oh, and was the demo character supposed to be the "slow" character? He just felt weighty, like their was a delay between my inputs and his actions. Not necessarily something bad, but it threw me off, at least.
And in regards to linearity, I guess what bugged me in the demo was the way it really funneled you. I admit that's probably entirely the demo, but for some reason it really got to me when they had you turn around and then allowed you to advance through an obvious path not because you got a new ability or hit a switch or anything, but because you hit the event trigger to have a skeleton jump up through the floor.
(Sorry if I'm kind of messing up the thread, and I really hope I don't come off as dumping on a game I haven't played. Just trying to get a feel as to whether I could potentially still end up liking the game after not feeling the demo).