Too few vector games released on the Mac. Notable contenders are TechnoManiac, Arashi and Battle Girl. I enjoyed TM, but only played it sporadically, Arashi had me coming back time and time again (I was a big fan of Tempest at the arcade, and I think Arashi is better than Tempest (in design, animation, sound and gameplay!!).

IIRC, the startup sound to TM was a funky digitized voice... (or am I thinking about the Hangman/Pacman clone Maniac?).