Just finished playing through the game...... do you guys even test your chapters? I mean, too many obvious bugs that just result in a dead end. Erave's chapter was very good, didn't 'kill the game' or anything. I liked the puzzles... at least.
Anyway, aside from game bugs, there are so many plot holes that make no sense, but at least you could blame Dara's weird perception of reality or the fact that it's a chain game.
Nothing wrong with battles in my opinion. The balance could use some work, but there are no impossible battles or anything. But yeah, bugs, tons of them.... I'll make a list later.

It's a very good game overall, although I think you ought to make a good conclusion that makes some sense Belross, DP might've put it back on track (with a cliche collect runes story, might I add!) but it soon got off it!