I tried to take a video of the "click to unfold" bug, but it didn't show it well because you can't see in the video when I am trying to click.
The bug appears to be erratic: It doesn't happen all the time, it happens about 1/3 times when I try to click a square that is on the non-folded side of the fold line.
Also, one more thought about the demo: If people are saying it's too short, that's potentially a good sign because they're wanting more ;)