My question wasn't so much about what was different, but more about why those things are particularly interesting. Throwing the second player, planning when to die and show up again, and beating the bosses in a fast way all seem to be things that would make the run more interesting...
I am asking because of submissions such as these:
http://tasvideos.org/1660S.html
The general rule is that when a 2-player run is slower, there are often two versions, as the 1-player version is the fastest game completion, and the 2-player version adds interesting 2-player gameplay. In this case, the 2-player TAS is faster though...
This is just a rule of thumb, and I am not saying that it applies in this case... but that's why I am asking why these different aspects are more interesting.
I don't know how many of the people who voted yes took this into consideration when voting, so some opinions on this would be nice. I did see that AnS wrote in the previous 1-player submission that he was in favor of 2 published movies for this game.