The future of the planet is in your hands. Choose the canons with the mouse and place them strategically. Use the mouse to aim and shoot. Hold the left button of the mouse to raise the power of the shoot.
Get rid of the enemies of this planet, don't let them attack you or abduct you. Get orbs to earn money and buy new weapons. USe WASD or arrow keys to move and mouse to shoot.
You're alone at the battlefield for a strategy mistake and the enemies are coming for you. Aim and fire until they're dead. Careful, they're everywhere! Use your mouse.