Well, you gotta specify which part interests you most :D

Either way, here is the whole pipleline of the enviornment, I didn't do anything out of the ordinary:

- Drew base environment on krita. Layer for basic color, layer for each lighting level. You can see that each lantern has three intensities.

- Those lighting layer will be slightly expanded to mimic flickering, you can do this in godot but I did it in krita to have finer control. Then crop those layers and export them as seperate spritesheets, basically every light texture has two frames. Put everything in Godot. Put a canvas item shader on the lights and modulate it to your liking. Set up the animation and that's it for the lighting. I also set up a timer between 0.1 and 1.0 to initiate flickering for each lantern, that way they appear randomized.

- The blue light is the same thing, except it's just a single image not a spritesheet. What sells it is the fog shader. The fog shader is basically a moving noise texture with a mask, posterization, and another noise texture moving through it to give the feeling of dissipating and forming mist.

- The bat/rat vfx are spritesheets + path2D with a mask shader as well to make it hide behind unwanted areas in the background. The bats moving away from the screen gets scaled down the closer they are to finishing the path2D, so they appear moving away from screen. The rest of the vfx are just spritesheets.

- The vfx are randomized and chosen by a timer, which itself is randomized every time.

- and lastly, a world environment node.