Your game was fun to play! I can tell you worked really hard on it. It looks like you got a ton done in the time of the jam. There's even an amount of polish on some sections like the lighting overlays which is crazy to get done in such a short time.
I was able to find all the available effects and mementos. The FAQ in the read me file was a big help, I appreciate that. I had some trouble with figuring out which hotel guests were necessary to talk to though. I woke up several times and would talk to everyone available, and I think the characters with dialog options are the ones who affect the dream, but even after finding everything I'm still not sure exactly what they change. A few more in-game hints about that would be helpful.
I thought the water pedestal puzzle was neat, though I spent a lot of time trying to get water from the fountains in that area and I'm still not sure if/why you can't use them. (I did eventually find a different source for water.) Nice job with the glass effect keeping the liquid the player picked up even after switching to another effect! A lot of fan games would not have been able to get that to work properly.
The protagonist staying at a hotel idea is neat, I haven't seen that before. I liked how the messy room and the concierge's comment about it help establish her personality. The mementos are also a nice way to reveal some of her history to the player. This is a great start to a game and I look forward to seeing any future updates!