Sub or dub?
• original > Jap dub >>> Eng dub
Ger, Kor and Viet dub sound decent but no idea how they are to native ears
If you can understand Japanese without subtitles, you'll definitely have a better experience with the JP dub. Otherwise, CN voice rules because it does have the most accurate character presentation.
• Eng dub is CENSORED, because that segment (very mild, really) is considered child abuse.
• Eng sub has some mistakes where the original meaning is clearly misunderstood. Dub has some misses too but fewer.
• Eng dub has an all-Asian cast, yay for effort?

Recommended watching order:
episodes 1–13 (not as interesting but 5 minutes each!) → movie → the rest of web series (ep. 37-40 is THE BOMB) & webtoon

TL;DR:
• derivative in spirit, original in execution
• appears simple, but meticulously thought out — withstood rewatches like magic
(btw it's neither serectly anti- or pro-government, some people need to stop categorizing art into either disguised protest or propaganda.)
(it's also not championing colonialism or justifying urbanization that sacrifices environment, pay attention to the actual movie please??? environmental terrorism is two words and the emphasis is on the second.)

spoiler-free review:
The director MTJJ has always been smooth incorporating references. He does it in a wholesome way without making people feel that he is uninspired or appropriating, because
• the plot actually makes sense, and none of it is unnecessary
• despite the Ghibli influence, there are brave, creative choices in art direction, such as minimal shadows on characters, and trading design complexity for dynamic action, cuteness and practicality — against the possibility that people will dismiss it as Flash cartoon (they did)
• in every wallpaper-worthy 'still', every sweeping or miniscule movement, every minor character in the background, the team's attention to detail fills the screen. It has so much love. Every nuance is calculated to make it feel organic and thus actually not stand out. Which is why it is so easy to watch and at the same time the most rewatchable thing ever. It's so natural yet has hidden SO MUCH lore and easter eggs. You can tell there are backstories and justification for why each character acts a certain way.

Back to its resemblance to other stuff — it's so fun spotting other movies in it, and they're not restricted to ACG only, which is better than what would feel like exclusive circle jerk. Don't get me wrong though, you don't need to know anything to enjoy it. The main series has very little to do with it.

Action scenes are noticeably better than the web series (before ep. 29, that is), which is already known for that aspect. I'll never tire of looking at them frame by frame. Since everyone is commending the action, it's worth mentioning my favourites are all slow scenes. Camerawork is extraordinary throughout, including slice-of-life moments where people tend to neglect the 'camera'. I especially like how it pans from nighttime streets to inside the 'domain' (yes they cheaped out on 3D models in that scene due to time restraints). The sparingly used silence worked to great effect.

Story is where it marks the greatest leap for Chinese animations. White Snake, Big Fish, Ne Zha, Monkey King: Hero Is Back... all have fatal flaws in their story. They stack clichés and at the same time choke on itself when trying to be special. All Saints Street, produced by the same studio that made LoH, is unfortunately also a mixed bag (maybe because the story is written by someone else?). But in LoH, tropes are used effectively — which is inconspicuously. The story is classic, but MTJJ has such a grasp on storytelling and pacing that it works. The movie takes you along for the ride. You connect with characters and feel what they feel. MTJJ said in an interview he wanted the tone to match Hei's mood so he insisted making the first part duller, even though it would (and it did!) drive away impatient audience. I think it's genius, although it didn't occur to me while I was watching because it just flowed. Everything everyone does is logical and everyone is respectfully smart. Very few things stood out that threw me back to reality. It's such a tight story, only 101 minutes and characters are all established. Twists, motives, all fleshed out, through very efficient use of dialogue, movement, even camerawork: it often shifts camera to indicate where a character focuses his eyes. If you want proof, all side characters have been noticed, to the point where almost all of them have gotten a fan base, including one character that has only appeared for 5 seconds in full. If that is not successful worldbuilding, I don't know what is. The hint of lore is strong in this one. My only gripe is it has a few dialogues that feed me information and the purpose is too obvious, e.g. when Wu Xian's friends each express their views, and when the flower girl makes her welcome speech. I was immediately aware why they're there and started thinking in movie-producing perspective, instead of "this is my world and these are people I'm talking to".

The most surprising aspect for me is the voice-over. Many of the voice actors are familiar names and I think they've never been this good (yes, even the legendary Shan Xin). I wouldn't say every line is perfect but none is cringy bad.

This movie is the definition of an all-rounder. Not the most original thing ever, but it just has so few slip-ups. Even the jokes are all good: funny, timed well, universal and tasteful, something even comedies — anime or not — very rarely pull off.

This movie.. it feels like home.
After the first viewing, I thought it was incredibly strong but the story felt too familiar to go beyond an 8. But I kept going back to it, each time noticing more details and being moved just the same. Then I realized how sincere it is and how rare it is to have a conflict-themed movie full of likeable characters. And it's so pure. There is no love plot, no bromance. Despite being a small studio, they resisted these shortcuts and focused on a world and a story they wanted. Not a single second is wasted. No unnecessary monologuing before action. No narrated exposition. No dumbass looking down on enemies. In the end, it is story, what I thought was the weakest card, that got me addicted. It is proof creators shouldn't be afraid of subjects that have been done to death — A better expression would be tried and true. If you love your characters, the audience would too.