I've heard of it, of course! And of course they're years ahead of my little hobby project.

But there's an important difference: They run on the browser via WebAssembly, the project is in Rust. Sfotty Pie is pure TypeScript, so, hopefully, easier to hack for a greater number of people. Also harder to make performant but why do we have all this CPU power if not to emulate 1.79 MHz machines using high-level languages :)