This was a nice breather after, uh, crossfire and GPW2. I did have a few issues with some of the setups - I agree with the intent of The_Uber_Camper's review although not the specific examples - and the explanation for the glitch did not really help me on my first few attempts, but fortunately that level is set up so that I can reread the message box as much as I want to.
The difficulty is a bit all over the place, like there's a few levels that took some grinding and others that I beat in 5-10 minutes right next to each other, but nothing is particularly unfair.
I haven't finished it yet, but after finishing the first world I do have to say that this is probably not a good choice to play if you're a beginner.
I say that because this hack suffers pretty strongly from creator bias; to put it simply there are many setups that enable the player to have a lot of freedom over how they tackle the obstacle (like a longer re-grab, a shorter regrab, hitting a block earlier or later) but if you don't play nearly identically to how the creator did then the obstacle is impossible to pass. The Yoshi level and the skytree were definitely the 2 biggest culprits of this.
With that being said, the hack is fun, it's very creative, but in the future while testing levels and setups, try to intentionally play a little differently and ensure that it still feels good to play.