The author mentioned handmade as a step in the right direction but the handmade creator more or less gave up on the project after a couple years and didn't accomplish his goal of delivering a final product.
The later videos are like cautionary tales… 5 years in, no game in sight, and you’re 30 videos deep into writing a sophisticated global illumination system…
Game design and programming are largely orthogonal skills, and procrastinating working on the former in service of the latter is perhaps the most common game development mistake of all time.