Thank you! Yes I edited the sprites heavily but used them as a guide. For others who have not seen the videos, Miziziziz makes really great tutorials that can be found here:
How to make a Doom clone in Godot in 13 minutes - YouTube
How to make Wolfenstein 3D style levels in Godot - YouTube
For the pixelated effect I used a tutorial by TheBuffED:
How to Create a Simple 3D Pixelated Effect in Godot without Shaders - YouTube