If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Space Invaders meet Tower Defense. A continuation of my Ultimate Space series. Expect to see the same great enemy fleet you have battled in the past, but now you get to build a lineup of gun turrets and upgrade them. Try to outlast your friends, and see who will be the ultimate defender!
Use mouse to play the game.
Left and Right arrow keys to move your repair ship.