I know there haven't been any real updates to this in over a year, but I finally felt like coming back and working on it some more. I pushed a fix for the screen tearing that was happening when loading textures, and I also implemented fog as close to the N64's as I could. Here are some screenshots:
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There's definitely still more I want to work on as well, so hopefully my motivation keeps up. Unrelatedly, I recently streamed myself playing this; if you're interested in nearly 3 hours of gameplay with derpy commentary, you can check that out
here.