-thanks I've been practicing working on my own custom assets (mostly art) for some time and I'm slowly trying to improve how I make them
-Sadly there isn't that much music as the title and battle music was the only thing I could find with the time I had. so I doubt it was corrupted.
-i could have spent the last 10 days polishing it more but life had other plans. I had to make a choice, to either do a quick polish or risk fixing my mistakes within 10 days (while life kept interrupting so I was too afraid I might miss the deadline)
-as for the final boss part. I have never encountered nor my testers encounter said bug before. it could be that you have killed the boss early and not trigged its event. maybe due to over-leveling (as I am still learning how to make certain events)
that is the only thing I can think of that happened.