Hi, I'm from the specific topic about music so I'll make feedback mostly about this part:
Music theme subjectively sounds good to me. I can really see that it has a well crafted melody with good attention to progression and tone. Not sure about how well it fits the game though, just because it really has strong Deltarune or similar game vibes — maybe it's not that straightforward and the gameplay needed something with more pure energy. Sounds are kinda okay, maybe some have a little too sharp or high pitch, but it's not that critical.