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Escape Velocity is a 2D roleplaying space combat game for Mac. EV is full of epic win, and is one of the most popular games released exclusively for Mac. Yes, it's kinda old (1996), but you can also get Escape Velocity: Overrride and, the best game in the series, Escape Velocity: Nova. I swear it's impossible not to like EV:N, you should download the trial (full version is $30). You start out making small deliveries in your little shuttle craft, and you can follow any one of six major storylines. I don't know if I can do this game justice with mere words, so I will just tell you that Escape Velocity: Nova is available for PC. Now you have no reaon not to try it.

Escape Velocity
Escape Velocity: Override
Escape Velocity: Nova (friggin' awesome)
Wikipedia's article on EVN