Lowered the grating covering the wall panel near the exit to prevent grabbing the cube underneath it. Found by s7eph4n. This also prevents a few other potential issues.

Fixed a few unintended methods to get the cube to the polarity reversing button found by ノラネコ and Calmly Frenetic.
Extended the gap between the button island and the middle walkway to prevent jumping without gel and cube tossing found by Camerson1313.

Removed ability to drop from the angled funnel to the exit platform found by Calmly Frenetic

Updated to prevent bouncing the cube across the initial gap found by ノラネコ.
https://www.youtube.com/watch?v=i_lbTceMs7M

Fixed an unintended solution found by lapicidas and •‹†ρđ› ĐūšР2ķ•.
https://www.youtube.com/watch?v=g-k4U3qc4dk