I am right near the end of the game (what I assume would be considered the final "boss" equivalent) and this section appears to be beyond buggy. Sometimes on the initial set of "bouncy" jumps I land short for no apparent reason (you literally just hold right for the first bit) and fall, except nothing in the fall is killing me and I fall forever until I go to the pause menu and return to the start screen.
Worse than that a bit further in when the little girl has to fall through a blue block and then "activate" the tall black enemies literally 50% of the time she falls through the floor to her death when dropping in when said blue block disappears (one time after literally standing on the floor for a few seconds while I maneuvered the blue orb she randomly fell through). This too on occasion does not result in her death, falling forever until I pause and return to the start screen.
This last section is already very long and rather difficult with no save points, having to repeatedly redo that rather braindead opening 25 seconds (I timed it) over and over as often due to bugs as my own failings has really soured the experience. The last five minutes I played I believe every single death was due to the game acting weird rather than me screwing up (which I have done plenty of times getting to this point). I turned it off after that and at this point I am 50-50 on ever going back to try and finish it up, I'm so close yet in this state I struggle to see the point.
I know this is made by a small team of individuals and you can clearly see the passion behind the game, and hence if this ends up read it'll likely be by someone who put a lot into this and will be bummed out to read this. I apologize for that and you have my sympathy, but for whatever reason this last bit isn't even in a passable state and it is a darn shame.