Hmmm...seems that this list is somehow incomplete, missing all Thomas Sontowski's top notch games like: "Robot Arena", "The Core", "Head On" and Vectrex "Thermometer" which of course isn't a game but I think it really has to get included.
"So those are all playable? Head On I hadn't heard much and forgot about it."
Yes, they are all playable and highly addictive too! They will all included in 'VecFever' cart. "Robot Arena" and "Head On" also run (a bit) better on the 'VecFever' (taking advantage of the calibration setting). "Robot Arena" has also a secret level, taking advantage VecFever's full potential / merit.
goddamn Head On is frustrating, it's like you KNOW you are gonna die and can't do anything about it for 5 seconds before it happens!
Quite challenging, more or less like in real life, isn't? :-) The more you play it, the more you discover its secrets. There are 2 different strategies to try the least so you can achieve some perfect track bonus and a real high score. Can't say more cause I don't want to spoil the fun :-)