My only complaint is that the "ground-pound" (or whatever you want to call it) should not be performable by double-tapping "up" or "w". I've missed on many chain-jumps because of that. It's way more intuitive to have it on the "down" or "s" key.
The game has problems with the "disintegrate" skill. I remember trying to disintegrate enemies that were 49/153 and 39/120 and it wouldn't let me disintegrate them.