I'd definitely recommend TECS for folks looking to learn more about the many layers of abstraction sitting under their interpreter/VM. Also worth taking a look at the Little OS Book or the OSDev wiki for some more insight into a less idealized/more crufty architecture.
I wound up spending the most time playing around with chapter 9 (the Tetris part of Nand to Teris) and made a very basic ray-casting game a la Wolfenstein 3D: https://youtu.be/c-J7lwKWDN8
I wound up spending the most time playing around with chapter 9 (the Tetris part of Nand to Teris) and made a very basic ray-casting game a la Wolfenstein 3D: https://youtu.be/c-J7lwKWDN8