ฅ/ᐠ｡ᆽ｡ᐟ \ Hello~
Just wanted to say I enjoyed the demo! The puzzles were intuitive, the atmosphere was on point, and I found the different colored lighting to be a nice touch. I appreciate the bits of lore given as it makes me curious about the overall plot. I believe it's important to set up a good story to help players invest emotionally in a game.
One recommendation I do have would be to provide subtitles during dialogue. It was hard for me to make out what was being said from the radio along with the film projector cutscene.
Gameplay wise, the biggest problem I had was really just the last puzzle. The art room puzzle was just too ambiguous as there was a lack of direction. It was hard to interpret the paintings correctly, and judging from your previous comment the player might've needed to know some backstory to figure it out. Not everyone is that knowledgeable on who Dante is and his life story. I think providing a cue or note would've helped with that part.
Overall, great demo with actually good gameplay! Looking forward to what this has in store for the future!