Here are my non-spoilery impressions.
Counting the story bits it's quite a big demo. I'll try avoiding spoilers, but if you thought the world of Catherine was messed up before, wait till you play this. People who didn't like the super natural elements are gonna be in for a shock.
The game does look more like a retelling rather than a 1:1 remake. So many scenes I didn't remember from the OG release. And not just Rin stuff. Honestly I'm very skeptical about how this might affect the narrative compared to vanilla, but at the very least we'll get to see and hear more from the cast that we loved so in the end I'm in for the new stuff.
As for gameplay changes, you can pick original puzzles or rearranged. I picked rearranged ofc. There are added rewards and new blocks. Like the type that was in the demo, was a group of blocks that you could push around together. I like the idea but the demo was too small of a sample in this regard to have a firm opinion on these new additions. Tho at the end of the day, if this sucks the option to play the classic puzzles is in the game so that's fine. I do say tho that I was enjoying the Catherine puzzles like the og release (even if they were a little too short here)
Lastly, with the way they transition from Studio Zero's logo to Catherine Full Body logo, I have zero worries about this game having anything censored by Sony lol
P.S: I like how now you can get more stuff on Katherine even day 1 based on your choices/text messages. Got a pic from her and she even called me. Have no idea what I was telling her tho lol