I'm not trying to be harsh, I was just trying to give my honest opinion. My favorite part of this game(one of my favorites of the year so far..) was the co-op puzzle solving/platforming and action sequences interspersed in between. Certainly for the price(free), I can't really complain that much. However, it did take the individual parts of the game and boil them down to one part per level and then threw them back out at you individually. One of this game's best strengths was that all of these things(puzzle solving, agility based puzzles, twin stick killing baddies and timed action sequences) is that they were intermixed with each other so none of them felt like they were over staying their welcome.
It's a fine DLC for free and extends the game about 30-45 minutes the first time. Would I pay for it if it was free? No, I don't think I would. I also don't think I would replay it in the future, I'd be more inclined to replay the original game instead, that's all. No achievements, no real ranking other than time(outside of the third level's hordes of enemies.)