Hey! Thank you for the review!
Yeah, the hiding of zombies originally a planned mechanic and it*used* to be easy to achieve in Godot 3 but some core changes for 4 sadly prevented me from implementing it. If I do continue with the concept past the jam, that's basically my number 1 item to implement. :)
WRT ammo, that, too, was a mechanic that I simply didn't have enough time for. I planned for more guns and melee but just didn't quite have the time.