The crazy thing is that while gravity is reversed, you literally cannot jump back down from those passages. It's really easy to get into that pocket and collect everything, but once you collect all the crystals, you're stuck with the Eyehopper until the power-up runs out, then you have no way to collect the ones in the middle.
Beyond that, the floating platforms have a tremendous amount of dead time where they're milling about underneath the floor, and they're never in sync or well positioned to reach a new area irrespective of what order you do the branches in. Had I been more scientific about it, there *might* be a route that saves more frames than the one I decided on, but there are enough possibilities that wouldn't be noticeably faster in casual experimentation that I settled on the path in the recording.