The 6 level long Facepalm demo, released for C3 summer 2016.
This hack has an emphasis on difficulty and creativity. I absolutely insist using tool assistance, savestates and slowdown. The levels here are difficult, but not very lengthy, and require very little, if any, glitch usage, making it a good challenge for intermediate kaizo players.
I really liked the creativity of this hack and how it's not your typical Kaizo hack out there. There were some minor breaks, but that didn't compromise the verdict this hack would receive. I recommend it to people who are mostly used to those sorts of hacks and take even weeks to finish each level.
And don't mind those low ratings, as the person could've elaborated the reason they rated it that way rather than just rating it and calling it a day.