If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
A fast paced fight for Earth's fate. Destroy waves of enemies and gather power-ups for the sake of all humanity. Every enemy gets you closer to the next wave- but don't take your time! Collect ammo and spend it wisely on the upgrades to make your job easier.
A,D / Left, Right Arrow Keys - Move.
Mouse - Aim / Shoot.