From a Steam review:

The game was advertised as having 40 new levels, which at first glance is sounds engaging and interesting, until you find out most of those levels are programmer/beta/alpha stages. It’s not entirely new content, but rather going through iterations until you arrive at the level as it is today. While interesting, it does feel disingenuous to advertise this as a new level. When I hear braid has a new level, I think “There’s one more puzzle piece”, but that’s not the case. You are not rewarded with anything in game, but instead receive some occasionally insightful commentary. In total, there are around 14 actual, new puzzles.