NEW UPDATE (not really a big one, unfortunately) :

I didn't plan the project before the beginning of the jam soo I created a little whiteboard in Milanote, I listed some "must-have" mechanics and ideas that I must add to the game, and some additional features that I could add if I had extra time.

I also downloaded some free-to-use assets from itch.io and modified some of them, rigged some of the characters, and I also did some level design.

By the way, I don't have much experience with creating 3d games, I'm more familiar with 2D games ... I did create one year ago a 3d game for the Brackeys game jam 2021.2  but it wasn't a good one. So I spend some time watching tutorials about how to create an enemy AI, import animations to unity, what's the difference between URP and HDRP etc ...

Honestly, I didn't accomplish much progress on these two first days, instead, I organised myself to achieve better results in the upcoming days.