I have finished writing a postmortem of Towels for Earth. The link is http://blazinggames.blogspot.ca/2013/05/towels-for-earth-postmortem.html . Quick summary for those who don’t want to read the article:

What went right – incorporating towel day themes into the game
What went right and wrong – Developing the game on towel day
What went wrong – HTML5 issues forced game to be done in Flash