This looks like a decent proof of concept, but it needs a good bit of work.
Making a 3D game in a jam can be quite difficult to achieve because to make a full game, there's a lot of different elements that need to fit together to make it work the way you want. This is definitely a good starting point though.
If you were wanting things to work on, I'd suggest figuring out if you want to focus on gameplay or visuals to start with.
For game play, I think the enemy detection and combat system needs some improvement. Enemies seem to spot you from behind walls and just appear behind you, while this isn't necessarily a bad thing, because you don't seem to be able to block attacks, it doesn't really give you the chance to explore the map. I also found the mouse sensitivity a bit strong, you might want to either just reduce it a bit or add in an option to change the sensitivity.
For visuals, I take it most of the assets were generic assets with some custom shapes? Do you know what kind of style you are wanting in the end? Also the world was quite monochromatic, for some games this can work well when the gameplay is snappy and refined.
I hope you carry on with it, and thanks for the game.