Just by the sheer amount of thought, effort and polish that went into this, in such a short stretch of time, I wouldn't be surprised if it would have been hard to get a lot of comments in with the time limit. The code itself has a layer of complexity to it (not super-complicated, but I think definitely a step or three above beginner level), but from someone who does work with code regularly, I will say I still was pretty much able to follow the code after perusing it for a bit. So don't get me wrong, I think it is very well done!