While the visuals were good and the sound design was the well established world-class performance, I feel like the director wanted to make something like a Bleach movie and was given My Hero Academia instead, yet went through with most of the same fights anyway.
This is straight up a betrayal of the source material, except for the last two minutes or so. Characters bleed more than in Saint Seiya, get impaled and choked like no tomorrow, and can still walk away just fine. Villains have powers or appearances unlike anything we see in the manga. Hyped moments from the main series get their themes reused shamelessly.
If you have the time to spare, watching it is fine, but don't expect anything besides a silly What-If.