I really like the concept! The combat is something I wanna see get expanded, maybe with something like blocking and parrying. One thing though, if possible, maybe you can add a sensitivity setting as the game's control is very reliant with the mouse, but then again, I don't know if that's possible with current state of GDevelop as I never dabbled with 3D stuff that much.
Edit: Okay I'm crazy I didn't even see the sensitivity option at the start hahahaha.