Island Wars 2 Xmas for Mac

From InterAction studios:

Ah, the South Pacific seas... warm sun, clear skies, crystal waters... too bad you won't get to see any of that because it's Christmas time! Nevertheless, those two little islands are still obsessed with destroying each other's Christmas trees and you seem to have been caught in the middle of it again! Hop in your sled and bomb the enemy island while using your cannon to protect your own Christmas trees. Engage in aerial dogfights while collecting bonuses to defeat 10 opposing islands and 50 invasion waves. Features 6 gametypes, 7 mutators, 10 gameplay parameters, 5 computer skill levels, bonuses, worldwide high scores. 1 or 2 players.