This is a disassembly of the firework sprite (7A), usually spawned after Bowser is defeated.
The four different types of fireworks (small, big, normal, heart) are included as 4 different .cfg files.
There are two options that can be turned on or off in the asm file, so read that for more information.
Probably. I may look at it in the near future
Edit: using level mode 10 (Bowser battle) makes Mario not disappear (as it should be, since it doesn't happen in the vanilla cutscene). I guess that mode 10 uses different OAM addresses for Mario's tiles? (so that they don't get overwritten by other sprites)