Genuinely quite fun. The goofy sounds of the enemies and their pre-rendered sprites pitched this at the perfect level of silliness to me - because no matter what anyone says, there will never be any idea as silly as a Christmas action game, lest of all an FPS. So I'm super glad to see someone else realise this and just roll with it! :3
My three main crits are technical ones - firstly, enemies get stuck in doorways often, meaning you can effectively get trapped in rooms, but it's a jam game, so what do you expect? (additionally, this is why I made my entry an enemies free experience - one week just isn't enough to make decent AI, imho).
Secondly, the weird lurching with the FOV when you move made me feel kind of ill after a while. I understand that kind of thing when running, but just when moving at all is too much. Third - and, this is an issue I've struggled with as well in the past when making my own projects in Godot - the lag spikes when a 3D scene first loads, due to all the shader and material pre-caching, are a pain. I prevented this same issue in my entry by making a scene that displays some quads and particles in front of the camera, and loading all the saved materials and particles in quick succession, one after another, while the HUD is being covered up with a black screen with "Loading..." text in front of it - it seems to solve the issue fairly well, for me at least. ^_^
Your main gameplay mechanic is fun, I love the silly enemy sprites, and the music tracks picked really suit the tone of the whole thing as well. Well done!!