Odin's official compiler is not a "simple implementation", and Odin was not designed to be trivial to implement either. Where did you get this falsehood from? None of what you said is correct.

Odin is fundamentally about simple as-in _intuitive_ to use, and intuition are anything but simple as-in _simplex_. Intuitions are extremely complex and complicated things, even if they seem "easy" to use.

Designing for people's intuitions about what feels right and feels "intuitive", is a lot more complicated than you realize. The entire constant value system requires a big-number implementation to get right.

Looking at the compiler for more than 10 minutes would you should that it is anything but trivial (I will refrain from using the term simple here since it is overloaded). Odin is more complicated than C, but less complicated than C++. That is both in terms of the language and the compiler itself. You can write a C compiler is <8KLOC (in C). It would probably take <50KLOC to write a _minimal_ Odin compiler (in C), if not more.