You are not falling, you are refusing to
The presentation suggests a descent and the name encourages that reading, but what is actually happening is the opposite. The orbs stream downward past you and vanish off the bottom while fresh ones arrive from above, which means every second you hold your position you are climbing through the field. Gravity is pulling you down the whole time and the only thing opposing it is whatever you can drag out of the nearest orb.
The failure condition follows from that. You do not die by hitting something. You die by dropping off the bottom of the screen, and there is nothing dramatic about it - you simply run out of things to hold on to and gravity finishes the job. Almost every run ends the same way: one grapple missed, then a scramble, then a fall that took longer than it should have to become unrecoverable.
There is one detail that punishes people who do not know it. Gravity is not constant. It gets stronger the lower you are on the screen, by as much as sixty per cent at the very bottom. Recovering from a low position is therefore harder than the same manoeuvre performed higher up, and the game never tells you this. If a save feels impossible near the floor, that is because the physics have quietly turned against you.