This has the bones of something really cool! There is a lot of framework set up here, this is genuinely really impressive for a jam entry. I think y'all have solid ideas of what would come next, additional upgrades + some of the refinements you mentioned in your comments below. One thing I would also suggest is adding some level of ambient light to your world environment:
From certain angles the character is just a silhouette and it makes some of the lighting really harsh. This is obviously a nitpick and not the kind of polish I would look for in a game jam game (look at my game lol, I only used ambient light + 1 directional light). I only mention this because it seems like y'all were going for a really cool nighttime atmosphere, and I think this would help you achieve that.
Great work!