Agreed on the jellyfish (and basically all the other stuff)
the invisible jelly fish are really annoying.
it fells like there are attacks just spwaning into existence from about all directions.
took my ages to even realize that there are a ton of small enemies scattered around that are only visible when they fly directly at you.
which is when it is already to late to dodge or fight back.
made the one long corridor very annoying, had to banish the hell out of it :-)
aside from that, the red glyphs permastealing all powers was a bit.. gamebreaking for me, even though the 2-tile-jump from me :-(