Thanks for your comment!
The battle has too many uncompleted works, including almost all the feedback animations...
I will remake the battle after the jam ended. (I don't know if adding things is against the rule, which makes a great reason for me to be lazy.)
The audio is a bug and is now fixed. Actually I made 2 clips of bgm generated by AI (again) with a little tweak and sync. It was made in 10 minutes and I totally forgot to test.