If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Resist the human invasion on your home planet by using the Freedom Tower to destroy all forces. Buy upgrades, unlock achievements, collect power ups and much more in this defense game. Enjoy the incredible experience through 16 levels,destroy a powerful boss and complete the game in the 3 difficulty modes.
Mouse - Aim/Shoot.
Space - Super Power.