Galactica: AD
simple graphics
simple game
intense strategy
Mac only

Firstly, read this review:
http://www.insidemacgames.com/reviews/view.php?ID=697

Secondly: Try the trial, it allows you to play for 100 turns for as many games as you want.

Thirdly: Tell me what you think of the game, i really like it and theres multiplayer support which i would really like to try if anyone is interested.

I've played games like that before... wish it went with windows too. :(