I--- The music and environment is really great, and makes the gameplay experience very immersive. Not much else to say about it.
II--- As for the battles, there are a few I want to mention:
A) The first map with Liu Su (Wuqiu Mountain I think) could be improved. There is an enemy creature that can cast an undodgeable stun and it can heal itself. It is the creature with the Starcraft zergling model ( I think the name was Spirit Fox or Spirit Cat, but I forget ). This unit should not be included to the starting zone in my opinion. Liu Su at level 1 is a weak range hero, with low mana regeneration. It takes so much time for him to level up in this map. Actually, the smart thing to do is to avoid all monsters and run to Wuqiu Peak (where you can gain Jiang Xiaoxie as your party member). But most people will not know about this, and they will be stuck on the first map for 1-2 hours trying to level up.
B) The boss fight at Bingdian Bohe's "Spin-off" (I think the boss name was Shu Weng). This is an impossible boss fight. Let me explain why:
The only way Bingdian Bohe could win this fight is if her mana shield spell can protect 100% damage. But the maximum it can protect is 90% if I remember correctly. This means the boss cannot be beaten, since Bohe cannot do enough damage before she dies + uses all her lives. At least if it was 100%, then it might be possible since we can buy many mana potions, and along with her mana regeneration, it will be possible to stay alive. I truly do not know how this boss can be beaten.
C) The boss fight at Zhui Yu's "Spin-off" (Chi You). First, I should say this is a very well designed fight, because it can only be won if the player collects all the extra lives in the previous map (in the Yuyuan). But, in reality, the way it is "won" is by doing nothing. The player just lets Zhui Yu auto attack, and the boss fight is won. Why is this a problem? Because I actually lost the boss fight when I used spells. The reason for this is, the reason auto attacking wins the fight for Zhui Yu is she has a passive stun, and the auto attacking allows her to stun the boss many times during the fight. This means she receives less total damage during the fight, and can win. BUT, because of the animation for Warcraft 3 spells, after Zhui Yu uses a spell, she often will not start fighting immediately after the spell's completion (If you know normal Warcraft 3, then imagine the Human Paladin using its Holy Light spell: it will stand there for 1.5 seconds before it starts fighting again.) So because of this time where Zhui Yu does not fight, she actually does not stun the boss enough, and then you will lose the fight, because the total amount of damage you receive during the fight becomes too high (when I say total damage, I mean total of all damage received during the 26 lives you have, assuming players collected the bonus ones in the Yuyuan.)
So basically, I lost the fight when I used spells, but I won the fight when I did nothing but watch Zhui Yu attack normally.
III--- As for the story, I am very worried that it will end up with Liu Su becoming very powerful and then saving the female characters. I am really happy the female characters here are powerful and strong, but I think it is a mistake in storytelling to allow a person who is originally weak/cowardly to eventually become the main hero (and I think this will be the case for the future parts in regards to Liu Su). It is almost like those japanese anime, where the strong female character introduces the weak male character to the magical world, and then in the end the weak male character saves the female character.
One of the best japanese anime I have ever watched (the english name is: "Blue Gender", year: 1999) does exactly this.
It had one of the best stories/character development I have ever seen, but then in the end they made the strong female charatcer be saved by the originally weak male character...
IV--- One of the best parts of this campaign was the NPC dialogue. It was really fun, even though it was only optional. Some of my thoughts on this aspect:
A) Wuqiu Village is an interesting case, since the NPC give different dialogue depending on which hero you use to talk to them. With Liu Su, it is normally something very interesting. With Jiang Xiaoxie unfortunately, all the NPC care about is talking about her beauty/marriage. It seems the only value women have in this campaign is appearance/marriage... With Bingdian Bohe, it seem the NPC are too shy with her to say much, but I think if she was not a stranger, they would also just care about her appearance.
Actually, in Zhangzhou, which is the place Bingdian Bohe is living, the NPC there are familiar with her... So of course, half of all the city is just talking about how beautiful she is.
Interestingly though, the other half all talk about how amazing it is that her Father, the country magistrate (basically an official of the imperial court) is not corrupt. Why is it so special that the county magistrate is not corrupt?
B) Some of the good NPC dialogue was when they forshadowed some of the future parts of the campaign. Like in the ferry crossing region, some of the NPCs mentioned something about the forest to the north east being dangerous (and then later we go there to rescue Liu Li).
Another good example is when the NPC provide us with completely new information. This is sometimes context about the circumstances of people living during that historical period. Other times, it is information about the different factions (like in the map where Jiang Xiaoxie meets her father, the NPC there give interesting information about the Tang Faction (information about the "Book of Poison" as well as the "Wudu Beast"). This kind of NPC dialogue is really great.
V--- In terms of bugs, I did not encounter anything. I did crash 1 time during the fight between Jiang Xiaoxie and her father, but that was because I had warcraft running for many hours I think (not related to the campaign). When I loaded my save file again, it did not crash during that fight.
VI--- There is a problem with spoilers in the "introduction" chapter (in regards to the story). I am guessing that Vanspirit made the other parts, and then came back to do this remake of part 1. This is a big problem for people playing this campaign, because the Introduction is full of spoilers for the later part of the story. Actually, I did not realise immediately when I first read it. But when I was later playing the missions, I remembered 1 of the things that was said in the introduction, and I realized it is full of spoilers. Maybe, for the chinese players, this was ok, because if Vanspirit completed the later parts before she made this remake, then they would already know the story. But for hiveworkshop players, we do not know the later story, so it is not enjoyable if the introduction reveals the endings for many characters in the later parts.
VII--- I had significant difficulty with the first map of each of the Spin-offs, in terms of finding where to go.
Jiang Xiaoxie (Shu Mountain faction map)--- One of the places the player needs to go is only accessible by walking through a room if I remember correctly (the island at the top of the map), and I had trouble realizing that the only way to get there is by walking to the end of the room (there was no marker or circle of power to show it would teleport the hero there).
Bingdian Bohe (Dong Baiyuan map). Because the map uses an alpha tile (I am guessing) (so the terrain appears to be flying/or something), the entire minimap becomes pure white, so there is no way to know the location of your hero in the minimap, so it requires people to form a mental map in their head of where the hero (Bingdian Bohe) is on the map.
Zhui Yu (Capital City map). The map is extremely big, and it is not clear exactly where the hero should go to for the main quest (for talking to the key characters). One of the places (I think it wad the second last talking quest on that map, the one where you are in the right side of the map, directly north of the river) was almost impossible to find.
But I enjoyed this campaign a lot.
Also, why is Liu Su surrounded by so many beautiful women?
This is a picture of my thoughts of Liu Su being surrounded by many beautiful women in this campaign (Bingdian Bohe, Liu Li, Jiang Xiaoxie, Lan Wu, (Zhui Yu?)).
Maybe the reason Liu Su is weak in this part is because there are only 5 beautiful women surrounding him. Maybe more women will be added in the later parts, so he can become stronger?
Actually, I think this aspect of the campaign is curious. Why? Because, this type of fantasy story (1 main male character, multiple female characters) is normally written by men... But if Vanspirit is a women, then it is hard to understand why the story almost seems like one of those Harem Japanese anime where the single male character is the star of the entire show.