There are a bunch of submissions and I wanted to give feedback to everyone, so I'm going to list some strengths and weaknesses that I perceive from the GDD's in this challenge (take with a grain of salt, I recognize the challenge this jam theme + time limitations, especially during a holiday weekend).
Strengths: This is a very playable game, it seems like a lot of fun.
Weaknesses: I personally would have preferred more visual representations in this GDD to explain some of the concepts more easily. The UI Interface & Graphics, gameplay explanations, and audio section could have had non-text elements and give a better understanding to the viewer. The core loop isn't a core loop, so it's impossible to tell what the core gameplay looks like from this section. I wish this had some story. There's an implication of story by virtue of having several characters, enemies, and lore about the Game World, but I don't think it's delivered in this document. I would also caution against this lofty promise you've made in the Genre section. Delivering these game elements in 30 minutes seems like a lot, and I think you would get more value out of stretching that amount of time. Based on the amount of content in this GDD (and what is implied by the content of the GDD), I imagine the base game should take at least 3 hours to complete, not including side missions. This game would (in my opinion) greatly benefit from having game pillars to guide you in further refining what is already here. You have plenty, I would maximize it and capitalize on what seems like a great idea.