I'll take Episode 77 as my ending (or ignore the last 8 min of episode 38 in the new format)
It was really thoroughly enjoyable, I loved it. Everything from the acting to the complex plot of the game levels to the music. Def rewatchable for me, I'm already rewatching it with someone.
As for the GOOD, it was actually GREAT, and there wasn't anything BAD in this.

I've rounded it up to a 10 rating because I've come to terms with the ending.
But my non-MDL rating remains 9.8 because, while I love ambiguous endings, I think endings to stories where you end up having to wonder if EVERYTHING you saw in the series was meant to be real or just the MC's dream/imagination, is just lazy writing. These kinds of endings would honestly generally raze any and all feelings I had for the show under normal circumstances.

That said, even after finding out that Lanzhu was an NPC, I found myself still entirely invested in discovering the outcome, I wasn't actually irritated at all, and quite outstandingly, I enjoyed the subsequent episodes as much as all the previous ones. I was surprised by this, because generally out of sheer irritation, I'd drop a show that springs the nonsense on me of a very VERY important MC not even being real three quarter way through a series (this long too). But I didn't want to drop this because I was really interested and invested in the plot and characters and after finishing it, I can honestly say don't regret anything I felt or thought while watching this, and it's very, very rare that I shed tears watching a show, but I did for this, so I'll give it a 10 to round up, but if MDL allowed, it'd be a 9.9.
Overall, I'm walking away satisfied.

Also, I choose to consider the mini episode of 78 optional because I think it was unnecessary, especially since 77 was far more solid as an ending for this series. 77 ended on a much, much more engaging, strong and ambiguously positive note.
So for me, Ep 77 was the close of this series.

HIGHLIGHTS:
- Too many to mention all of them, but I enjoyed the Sanatorium Door and the Box Master Door SO MUCH and I love the ost song The Door by Xia ZhiGuang.

As for the BL aspect. The censorship is hella obvious, we're all too familiar with it now in Chinese BL's, it's always so clear, what with how the ML's don't even so much as hug each other even when they're emotionally staggering specifically because of something going on between them, but they're touchy feely with everyone else ? This is as common and unrealistic as ever. BUT the emotionally charged conversations between Lanzhu and JiuShi are SOMETHING ELSE. Really. As well as some of the scenes in which the way LanZhu looks at JiuShi is very intense. There is a quality to those moments that carries beyond the censorship. This show definitely goes beyond bromance, their feelings for each other, especially Lanshu's from very early on, is pretty obvious and only become more obvious as the show goes on.

I always briefly think it'd be great to see these shows redone without censorship, perhaps not by China, I thought the same thing about The Untamed a long time ago. But then I realize I don't ever want to see characters like Lan WangJi, Ruan NanZhu, Wei WuXian and Lin QuiShi played by any other person other than the actors in the Chinese version, and I quickly forget about that idea. When casting is perfect, it's perfect, it is what it is.

Edit: After finishing the novel and I gotta say, the ending of the book is 11/10.
That said, where I usually think the original is best, honestly, I'd say I prefer the series in more ways than the book.
Comparing the two;

Book preferences-
The Ending
Some of the door events and conclusions
The relationship (BL) duh

Series preferences-
Basically everything else
I even prefer the characterization changes and choices in the series when compared to the book, which almost never happens for me. What they did with the series actually added gravity and a lot of emotion to the plot that I didn't feel reading the novel.

Also, imo, I don't think this is bromance at all. I've always taken that label on Chinese BL's with a grain of salt, we know the original is not bromance and they basically HAVE to call it that, it's almost like a bad joke.

So, yeah, whether you like BL or not, I would recc it!