The Heaven's Feel movie is exactly what intended to be: An adaptation of the final chapters of the Heaven's Feel route and after completing this film I now understand the idea of even adapting Fate/Stay Night into another medium (This includes other VN adaptations) misses what Fate/Stay Night is and what it does entirely but that's not the point here.
Is this movie worth your time? If you already followed all of the fate anime before this, understand that this is the end of the series. Its true climax. Every character has finally been explored and their arcs completed, every stone has been turned now and we've been rewarded with the most Happy End seen so far in Fate and it's a satisfying one. As you'd expect the fights look great since it's ufotable but for those like me who prefer a fight to have more grounded choreography you won't find that here but if you've reached this point you're already more than aware. If you haven't refreshed yourself on the Stay Night series I'd recommend you do before watch this film and keep in mind that every route is a direct continuation from each other (Fate -> UBW -> Heaven's Feel). I know you understand this is the necessary order but ever wonder why is that beyond just "that's how it must be"? (Spoilers ahead)
Heaven's Feel is the end of Fate/Stay Night, it's impossible to reach this route without completing the previous two and understanding this will make the structure of Fate immediately more clear of why it is the way it is. Why must the anime/VNs be experienced in a specific order? Because the story progresses from the last, why is it that there's blatant holes in the narrative in everywhere? Because they're separately explored in each route and even in Bad Ends in the VN.
The entirety of the Fate/Stay Night Visual Novel IS the story Fate, rather than it hosting 3 different stories that give different points. The very start of Fate, from the first time we meet Shirou in the Fate route (Deen/Stay Night) he's a character that's conflicted and heavy under-values his life and by the end he becomes Archer, realising the scope of his dream. UBW Shirou then has to confront Archer, who represents the reality of what Shirou will become and ultimately Shirou accepts that fate but still under-minds the fact his choices are still based on others and still under-values his life. Then we reach Heaven's Feel Shirou, who completely surpasses Archer by adjusting himself to what HE wants instead of what should be and finally values his own life even if for the greater good as he proclaims with the most genuine emotion he's expressed this entire Game/Series "I want to live". There's plenty to unpack with jus Shirou alone but you're smart enough to understand on your own time.
All in all, I've found a new respect and even love in this series which I haven't felt when I started. And even with these high effort adaptations being made for Fate and they are well done in their own right, it simply could never replace the experience of the VN and is the more recommended and ideal way to experience Fate/Stay Night. If you're a fan of the anime for more than its action I do think you'll gain the better experience there.
