Since the rules don't really discuss what type of combat is required, I'd say you're free to implement whatever makes sense for the game you want to create. But, that said, I'd aim more towards the idea that this game jam is leaning in the "traditional roguelike" direction. The host of the jam even embeds an animated example of gameplay which really exemplifies what a desired game submission might look like.
I am interested in the idea of adhering somewhat strictly to the concept of a traditional roguelike simply because I've actually never built one. I find it to be an interesting challenge to take on and to do something I would not do otherwise.