@densch It isn't counted as double jumping, it's just very easy to accidentally do a double jump instead of a wall jump. I just got the green bird on that level
I beat it shortly after making that comment, at about level 41 I think? Admittedly I did eat through a lot of skill whispers doing it.
Currently grinding with snakes as Into The Fire is kicking my arse and there's not many quests left to level up on ^^" (I'm getting to the point where I can solo deadfields at least)
Admittedly, playing a little more, it's just the Aseneekiwaka I'm annoyed with. It's not a threat in the slightest, but takes some 25 hits to kill. The other healthier enemies at least provide an active threat to keep things interesting.
(To be fair, the whole Fatal Fortress where it seems most these guys are is a pain, anyone good enough to beat the top level will not even be remotely challenged by those bellow it)