Hey man! I thought this was really fun! I died a few times but kept wanting to progress, until something started shooting at me? I panicked. This had a nice horror vibe! The zombie gurgling noises were great, it really pulled me in.
One regret over your awesome aesthetics otherwise is your use of color in the game. I really liked the black and white aesthetic, and find that the green for the health bar, and the colored bullet icons, really took away from the aesthetic you were otherwise nailing down.
I noticed you use a AZERTY layout, so I had to press Z on my keyboard to advance (I don't like using arrow buttons like this). However, there seems to be a quick solution for your control schemes, since you say it's too much effort to put a user setting for it. Notice how ZQSD and WASD share the SD but not the others? In your Godot actions, it's really easy to set 'forward' for both Z and W, and left for both Q and A, if you don't have other actions needing those keys. May be a tip for your future games.