Well it's a NES demake, and it is free, after all. I'm pretty sure it was just a neat programming project to do, and to add some of his own puzzles, rather than actually making something that looks good. The original game looks amazing (would recommend checking it out), but that was polished over a number of years; this is just a small tribute made over 2 months.
I get your point though, I just think it's cool that it exists, so I'm not complaining.
I get your point though, I just think it's cool that it exists, so I'm not complaining.