Interesting, I just ran across this by accident. This guy was one of a two man video game company that came out with a few games for the Mac in 1993 (or maybe that's when they *started* coming out with games; I know they did these two and another one called Space Madness).
The video's an hour long but I haven't seen much of it, so if anyone checks it out let me know what the differences are with the games, as when I was skipping around it looked like there was some power-up that he picked up at some point (there might be several, as one he got during the video was a shield recharge). Kind of curious what that's about, if there's more than one. I know with his game(s?) you have a shield and got a bonus after destroying the castle, at least, which the original Star Castle also didn't have.