A single instruction Zach-like sounds delightful, thanks for adding more cool programming puzzle games to the world :D
Personally I'd appreciate an option to view dark text on a light background. I understand if that goes against the theme of the game as being reminiscent of a particular period of computing hardware. (I had a similar issue with TIS-100...) I've half a mind to root around in the browser tools to see if I can edit it on the client side :P