https://gondolaprime.pw/games/starfield/index.html
Developer console shows approx ~7MB transferred. Still more than I would have expected for literally just a small looping animation but a bit better than 30MB at least.
Maybe there's been some progress on this front.
Thanks for the TIC-80 recommendation - I really like that it supports multiple langs (Lua, JS, Python, etc) - that's some great flexibility.
EDIT: It looks like TIC-80 games pull a tic80.wasm file which is approximately ~6MB in size. I'd say Pyxel and TIC-80 are roughly comparable at least with respect to bundle size.