Well, there is always no or other as a genre option.
Unless the player controls the runners, I would not call it action.
The genre selection on itch seems to be less about content and more about how the game is played. Auto-battlers and idle games would be missing from that list. Also gambling/casino. And some genres do have to do with the content.
To me, horror would be a genre, as I would say, I want to play a horror game. But that is a tag.
racing and strategy might apply. Especially if you can influence the death race somehow. You can have more than one genre. It is just tags.