Does Larian engine support such animations?
If you hit the enemy hard enough they will spin like a tesseract about to transport a planet to the other side of the universe and then turn into what looks like a sailboat sail that is about 120 feet long, half buried in the ground, and the color of like their sleeve or something, but now stretch across the entire surface of the part of them that sticks out of whatever dimension you just sh&t stomped them into. Does that count?
This is what I'm going to describe my next kill as when my DM asks me our style of "How do you want to kill them?".
In all seriousness though, I agree with OP.
Crits especially should have some kind of unique kill. The camera is a great start (Though I've only seen it function correctly once).
The lack of kill variety is also probably due to the fact that, from what I've noticed anyway, there's only one way your characters swing their weapons. Hopefully they implement more, then tie those to specific kill styles.