All AI die the exact same way. They turn/fade out as red.
It would be nice for – the bosses at least – to die in some different ways, different animations depending on the bosses themselves.
Depending on what they were killed with (special, tiles) and that can be many different things too. Maybe if they get killed by a “slash” attack, they split in two (not gorey, I understand it needs to be family-friendly)… but that kind of thing, you know
It might just make things less repetitive to look at.