Uses standard magical-girl visual language deliberately, as setup for a genre-defining tonal reversal partway through.
Magical wishes carry real, escalating consequences treated with the same internal seriousness as a hard-magic power system.
Continues the story past the TV series — widely considered essential rather than an optional side story.
Often recommended specifically to that audience — the show is widely discussed as using and subverting genre conventions rather than playing them straight.
Yes, particularly Rebellion — the film trilogy continues the story and is generally treated as essential to the complete narrative, not a optional epilogue.