The tracing border around everything makes this more like classic DS style than N64 style. It still won't feel like N64 but at least it would look better.
If there isn't, please consider implementing it.

If you want, you can download the source code and mod the game to get rid of all the post processing effects. If you go to the file Source/Scenes/World.cs and comment out these lines of code:

It will give you the desired effect.

Before:

After:

You can also do this without recompiling the game by changing line 54 in Content/Shaders/Edge.glsl to:

o_color = col;

Thanks both of you. Sorry I won't go out of my way to recompile a game because of that, but I appreciate the help. Surprised I got -2 just for asking a feature, tho.