A port of NXEngine-evo to the N64.
Automatic builds of the latest NXEngine64 are provided via GitHub Actions; you can download them on the releases page. You will also need the original Cave Story with Aeon Genesis translation; a pre-patched version can be found here.
From NXEngine64, copy NXEngine64.z64, nxextract.exe, and the data folder to a new folder. From Cave Story, copy Doukutsu.exe and merge the data folder with the existing one. Run nxextract.exe to extract assets and append them to the N64 ROM. You should now be able to run NXEngine64.z64.
To compile NXEngine64, you need to have libdragon installed. Once that's set up, you can simply run make in the project root directory to build. To compile the nxextract tool, run make -f Makefile.extract.