+1 to this. Not sure if it was just that 'play' was too fast (I agree with the other comment about 'play' probably not being super useful here), but on my 27" 2560x1440 monitor, it took me a few slides to notice that there was even text at the bottom changing. I thought I was just supposed to read the comments.
+1 - came here to say this. I love the idea, but the text block at the bottom of the screen and the corresponding code at the top left is a bit of a pain to go back and forth to with your eyes before the time runs out. It would be great if the text was much closer to the code.