This looks like a great project, reminds me a lot of development for GameBoy using GBDK especially with clipping screen buffers for scrolling.

I ended up writing a rough JS implementation of GBDK and used Emscripten so I could debug those kinds of things while making GameBoy roms.

https://www.gbdkjs.com/docs/example-projects/

There's something about working within the limitations of retro systems that's really fun.