well, good job making it that far! farthest i've heard of anyone getting yet :)
i do think i am going to push a change later today-ish that will do two things: enable skipping levels (to some degree), and also just small nerfs to many levels, including possibly that one (probably raising the stalactites slightly higher). i believe any saved progress will carry over.
the double jump is an interesting one. i find it very satisfying to execute these sorts of tricky/awkward input sequences. it was one of the first mechanics i designed for the game and i think it is still perhaps my favorite mechanic in the game, as it is both very awkward but also conceptually very simple. i won't deny, however, that it can be a very frustrating mechanic to deal with. in fact, that it sort of critical to its charm for me: mastering a frustrating mechanic results in a unique flavor of satisfaction, in my opinion, and that's what i want from this game.