cherepaxa: It's not really accurate to say that a Magic Mouse won't work for this game; I just played it with a Magic Mouse. In the Mouse pane of System Preferences, you can assign the right side of the mouse to be right-click ("secondary click").
That said, I agree that there should be an alternative to right-click (perhaps Ctrl-click, which is _not_ an automatic substitute on Mac OS for right-click AFAIK), for reasons of accessibility.