Nice game, I liked the mechanic!
I do believe that the difficulty was a bit high, at least for me. I think it was because of the combination of the grappling left/right and up/down + the need to time the jumps - I found that not so easy, even in the tutorials.
I think there's a lot of potential with such mechanic, and one thing I learned in the previous jam is that what might be easier for me, could be much harder for others (especially if I play my game all the time when I build it, and just get good at it eventually, and others obviously play it for the first time in the jam). So, if you intended for the difficulty to be this high that's alright by me, but if you didn't I think its important to keep this point in mind.
Good job overall :)