Nostalgia

If you can figure out the path, I don't think following it is that hard.

The holds are surprisingly manageable for a 21. If you can distinguish brackets from double-taps in the highlight section, it's a smooth clear.

The BPM is slow, but the bracket holds are quite confusing.

If you don't twist during the mid-section long-job, you can just mash through the late spike. There are many notes that look like brackets but aren't, so jumping the 2-notes is also an option.