I know is not fair to rate a movie based on the circumstances on how it was created, however, this is a remarkable accomplishment for a movie filmed in one shot, with almost no budget, basically done by a bunch of friends.
The premise is basic and certainly not very original, two people meet before a party and start chatting, getting to know each other, talking a little bit of everything. The acting in general is good and it feels natural.
This might not resonate with everyone, but I appreciated that, contrary to the great majority of Mexican films I have seen over the year Preludio does not talk at all about Mexico, it's idiosyncrasy, political or social situation, violence, drug lords, etc.
Strange enough, several year later there is no news from the director Eduardo Lucatero. I even found 2010 information that he was working on a (non-direct) sequel "Epilogue", but nothing so far.