I would like to mention a bug a ran across last night.
I was playing the tower section, and part way through it I saved the game and stopped playing. Later, when I continued to play, I restarted the game from the save point (part way through the tower), and I was not able to continue from there - instead it just showed the tower section, scrolling from where I saved it up to the top and then just stayed there. I was not able to exit the game in any way whatsoever, even the Pandora button wouldn't kill it, I had to remove the battery and restart my Pandora.
So I could not restart from the tower after saving there, and had to restart from the last teleporter (which allowed me to play the tower again and grab the two coins on the way, so it was not all bad). Just thought I'd mention it here.