If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your mission in this tactical slidescrolling shooter free online game is to take the role of a Marine and blast enemies and upgrade your warrior as you try to save the planet from impending doom. Try to find the time machine to prevent the coming of thousands of alien usurpers.
Use WASD KEYS to move.
Mouse. to aim and fire.
Use Number keys to change weapons.
G to throw a grenade.
E to use items.
Z for time warp.