Comment by arthulia

The games aren't really about the language--which have maybe 12 instructions at most--they're about the challenge of working with an extremely limited instruction set. They're puzzle games disguised as games about assembly languages. A game using a real instruction set might be fun for some people, but it would feel a lot different, and probably have to be a lot more challenging to make up for all of the convenient instructions. At that point you're basically just programming.