The slowdown gimmick will cause trouble for players who don't have much experience with this song. Two things can help alleviate the difficulty: listening carefully to the song and watching videos of other people getting it. For the arc+hold note patterns, the second pair actually repeats slightly slower than the first pair. (The final one throws a bit of a curve-ball, so be ready for it.)
The hill-like arc notes during the drop midway through the song go slower than you might think. It might take a couple plays just observing them to figure them out.
