After getting the hand upgrade you was supposed to bounce from wall to wall to clear the very next long vertical wall. I've also encounter the bug you mentioned after the 48 hour deadline so I was unable update the game (should be fix by changing 1 float *sight*).
After getting the dash, you can use it to clear the wall right next to it. In the next screen is a semi puzzle that you have to solve. I guarantee you that all the context was there and if you look around you will be able to solve it.
A hint is that you can break your fall by dashing. This will end the damage calculation at the point you dash and start again after you countinue to fall, meaning you can fall from nearly twice the original height.
Anyway, thank you for playing the game and leave a review.