When you pull yourself up with the orange funnel against the grating, you float for a couple seconds, this is a game glitch, but so people can't abuse it, I added a small object around the portable surface.

Made horizontal portal surface to the right of the big observation room smaller, you now shouldn't be able to toss a cube up into the funnel.

Made ledge next to polarity switch higher, so you can't cube stack onto it.