It's worth pointing out that Handmade Hero is not an example of how anyone should approach making a video game, and even Casey would say that, since that isn't his goal.

Use libraries. Use frameworks. Don't use C++ but reimplement the stdlib because you hate C++ and assume it was designed by morons. Don't spend... how many years has it been now, nearly ten? On a debug room that looks like a high school CS project.