There's definitely a lot of growth between the original and revamp, in terms of writing and everything else.
However! Honestly, going from the revamp to original is not as jarring as you might think. The writing was already good and although there are some rough spots with the visuals, it was still enough to keep me stuck in my seat (think I finished it over two days lmao) because the writing in this one really carries the story (where others might be less story focused and definitely less focused on the inner lives of the characters).
I'm trying to pick my favourite parts and I keep coming back to the way you're able to describe Zack's anxiety. The way he kinda shuts down and retreats into himself and has to really think about things when people speak to him is eerily similar to my experience, so makes sense I would relate.
Braden is such a uniquely sweet (I can't think of another word for him) character, I'm not sure I've ever read or encountered anything like him in any other media. Which is special. Not to say the protag isn't a great character as well, but considering he falls for Braden, it makes sense that we would also kind of fall in love with him through his eyes.
Okay I think I'm done now haha.
EDIT: Forgot to say I adore the ending and when we pan over to see Braden sitting across from him with that lil expression I almost died and it reminded me of a detail I hadn't flailed over enough... in the revamp, Braden sometimes sleeps curled up on his side but with his arms curled into his chest like a little kitty-cat and let's just say.. cutest shit ever.