This makes me wish I had gone to grad school.
This work is not really a product of higher education though. It's one of creativity, tenacity, good programming and more than that a deep knowledge of the NES architecture! Most people have the capability to do the last two regardless of education!
The more I read about 8 bit computing the more amazed I am. Needing a very detailed knowledge of the underlying system was a given then, unlike today. What's massively impressive is that some hit games back then were developed by teens in their bedrooms (so no grad school!). Miles away from the game industry we see today!