[10] On October 31, the group revealed and performed in advance the sub-unit songs "Secret Diary", "Better Me" and "Night Drive" during their online concert GFriend C:ON.

[11] On the same day, members Eunha and Umji showcased a tip of the song and the choreography for "Mago" on the show Knowing Bros.[12] On November 4, the highlight medley for the album was uploaded on HYBE Labels' YouTube channel.

[19][20][21] The songs "Apple", "Crossroads" and "Labyrinth" were previously released from the prior '回' album series, with the tracks having updated harmonies during the choruses.

Beats Per Minute called Walpurgis Night as "a bold, vibrant and occasionally experimental album that finds GFriend shedding the melancholy of their previous two releases.

"[22] IZM gave Walpurgis Night 3 out of 5 stars, stating that, aside from a slight sense of incongruity, "the good melody, which were the center of the team, is safely inherited" in GFriend's new path;[23] however, it found that the '回' trilogy clashed with the group's previous releases, "trying to burn too many stories and excessive intervention that does not seem to take into account the existing identity.