A shady character walks up, swings his knife back and forth and the other character drops with a scream. Am I violating any rules?

There's no blood and the animation is like 20 knife swings a second so it looks cartoony too. Is this going to disqualify me?

You'll probably be fine, the NSFW rule is mostly about nudity/sexual content or over the top realistic violence.

Cartoony violence in a game is fine.