The replay mechanic is incredible and absolutely maddening. The way you get stuck on walls can really gum up a run if you're not careful, so I ended up just trying to shimmy to shake off of them. At one point, I tried to "save" information by jumping at important times, but I ended up just having to focus really hard and use the metronome. Level 11 nearly killed me but it was soooo good to finish it.