This is lovely! Is this your first N64 game? How much documentation is there for aspiring N64 developers?
n64.dev is a pretty good place to start as far as links go.[2] People often use an old copy of the official SDK. There's also libdragon, which is a promising new open-source toolchain. [3]
[1] https://danbolt.itch.io/lunar-assault-64
[2] https://n64.dev/