[Nullabillity]

Silicon Zeroes[0] is also a pretty good next step if you enjoy these games. Doesn't quite get down to the NAND level, but gets into a lot of fun performance optimizations instead.

[0]: https://store.steampowered.com/app/684270/Silicon_Zeroes/

[linkdd]

I'm currently wasting my time on screeps, but I'll take a look, thanks :)