I was looking up the lyrics for the song 反面教師為貴方覇本日怒上昇中乃巻 by 久保あおい (youtube link), and I noticed that the lyrics are entirely in kanji. I thought that was interesting since its a song, not writing, so I thought that nobody would be able to tell that they wrote it entirely in kanji. Would a fluent listener easily notice the song is written entirely in kanji by just listening, and does it flow unnaturally because its written in such a weird way?
Judging from the lyrics, most of them are not proper sentences, more of arrays of words. Also in some places, there are 当て字 (use of phonetic equivalent) like "地獄覇", where 覇 is used as a kanji for the normal particle は.
So just a plain listener won't think that it is written entirely kanji. It is weird more because there are not many sentences that make sense. I guess it is mimicking Buddhist mantras.