For how short this demo is, it really delivers!
I'm intrigued by the world and the mistery surrounding the main character. I liked how the time system works and I actually played this twice to get to see all the content.
The character designs are all so cute. Dare I say, huggable. And for their writing itself, understandably there's not much you can learn about any of them just yet, but they all have discernible personalities so I'd call that a success.
I only have two critiques: The first one is that I find two of the music tracks too short. For the cutscene when Oberon first appears and when he awakes the MC on his second day, even if they only play for half a minute or so I believe they're too brief of a loop.
The second one it's that redaction could be better. I'm guessing English isn't the author's first language, because there's many mistakes and sentences that are weirdly written, which is a shame because the dialogue on itself it's good and I genuinely care about what all these people have to say! So yeah, I think it needs a rework in that regard.
Overall, tho, pretty decent beginning. An interesting start is vital for any story, so that's a job well done.