Narrative flaws (easily fixed, too) may take you out of it a bit, but still worth a watch.
https://comicscene.org/2021/02/17/comicscene-film-review-schools-out-forever/ (https://comicscene.org/2021/02/17/comicscene-film-review-schools-out-forever/)
Just wacthed this and it's not too bad a movie parts of the plot don't make sense but all in all it's worth a watch and a good way to spend a couple of hours
Kids Rule OK The Motion Picture? Lovely premise but doesn't sound like it quite lives up to it.
Looks like The Guardian enjoyed it: https://www.theguardian.com/film/2021/feb/10/schools-out-forever-review-gloriously-gory-ya-sci-fi-horror