I played the demo on my Steam Deck and the visuals look great on that screen! The artstyle really looks amazing and I enjoyed the gameplay you show so far. I'm looking forward to the full game!
The only bit of constructive criticism I want to give you is that the music didn't feel as polished as the other parts of the game. The short, repeating notes that are playing behind the melody made my ears feel exhausted after playing a while and hearing the same thing repeated constantly.
The song could absolutely have a part like that, but I think it would be nice if the song could have a few more sections, where the short, repeating notes go away and some other instrument takes it's place.
Keep up the good work and good luck with the rest of the development!