While it’s nice you posted a GitHub repo proving what you need does not work, it’s still considered polite to demonstrate you have made an effort to fix the problem(s).

What have you tried?

Following up on this, I don’t think a process per cell is a particularly good model for how cellular automata work. There’s no real concurrency in play, as the whole program has to operate in a stepwise fashion. Each cell depends on the state of the previous cell, which if those are different processes will result in a lot of message passing.

Now, from a “let’s play with it” standpoint, go for it! But may lower the process count to start with to make debugging easier, and grow it as you gain confidence in how the program is working.