Actually, it's hard not to wonder if the entire calendar is off by a year. Making Spellrazor in the spring of 1981 would mean Bower had never seen Tempest or Robotron or (I think) Omega Race. Defender would have been out there, barely, but I don't know how fast distribution channels got it to various cities in the US. Spellrazor screams with the joy of taking something to the next level, but it feels like it's building on the aforementioned classics, not on Pac Man and Space Invaders.
So even taking into account his modified hardware, this would make more sense to me as a project from 1982 than 1981.
This concludes maybe the pickiest post I have probably ever made on the internet. Please enjoy. :)