THAT MAZE!!! Still found a couple of ways to get stuck, so the buttons are now finally replaced by infinite pedestal buttons. I tried to avoid this since it trivializes the way back out of the maze, but it seems to be unavoidable.

The top player used to be able to get the bottom player stuck in the maze by leaving without them. This is now no longer possible.
Also fixed a bug introduced in the last version.

Changed the floor at the end of the labyrinth into glass (rather than grating) to avoid the top player displacing their portals while in the button room. It should no longer be possible to get stuck there now.

Added glass panels to allow vision into the exit room from the final buttons of the puzzle rooms (to visualize progress and show the next step).