I've designed lots of conversational UI over the years
mimicking mobile native UI on the web is not new. Nowadays there is a ton of ultra sophisticated frontend tools that allow you to build this, and a million other things. Dependencies, complex setup, hard to truly customize... overkill.
The idea is to simply tell a story like if you were texting a friend, on a webpage
I think it's cool
(of course it's responsive)
more philosophically, I believe that most websites are just people and company trying to put their voice out there. The web has weird standards and websites are trying to seduce us. What if you told your story in this format instead. What would it look like? Would it be convincing?
You can try it in 2min
there is something to this format, it's familiar and creates an instictive kind of storytelling, like a text thread