This game has had me coming back and replaying levels over and over. Not only does it challenge you to build a process for transforming molecules, it pits you against the entire playerbase by displaying your scores for three stats (very relevant in-game... space consuming to explain them here though) against graphs of the entire community's performance. That, plus the ability to totally re-think your designs and eke out a little bit more speed or use a couple less instructions, makes for delightfully addicting gameplay! Out of all the games I've picked up in the Humble Indie Bundles, this is the one that I consistently keep firing back up. :D
