Honestly, I think I prefer the old, more-plain UI. I'm sure I can learn to love the new style, though. Here are the notes I have so far:
- Minor note -- you mention possible problems with more than five choices -- five choices (such as in the west hallway) is already overflowing and partially-covering the clock. The choice boxes could afford to be closer together, or to fit more tightly around the choice text.
- The new top bar buttons are overly-abstract and do not have distinctive silhouettes. The pastel colours don't help there. Perhaps consider reintroducing the old icons into the new Notes menu, alongside or behind their new text labels? In the same vein (or perhaps the opposite vein), it's not clear that the History and Credits buttons in the options are the History and Credits buttons, because there's no text label to that effect.
- Returning to the topic of pastels, the shift from light-text-on-black to dark-text-on-light makes the whole screen brighter in a way that's harsh on tired or sensitive eyes. The darker UI with light text was a lot easier to read. Maybe you could value-invert/palette-swap the new UI and add a Dark Mode toggle?
- This is the big one. While the other points here are variably matters of taste, this is less so: the new save menu is a big step down from the old layout, functionally. Scrolling lists are easy to get disoriented in, file numbers or no -- with static pages, grids, and big screencaps, spatial memory is more-readily involved in organising saves. Functionally, there are now only three saves per page, not ten or six, because only those visible when you open each page really matter, and the new tiny thumbnails (yes, I saved) make it that much harder to recognise the save you're looking for. Plus, no-one was using 600 save slots anyway -- why would we need another 400? XD
The new dialogue boxes are pretty though, as is the new options splash. Nice work. If you got this far, thank you for listening to me gripe. You've made a very good game so far.