Don't touch the aliens, they stun you for a couple seconds. Your character is controlled by using the mouse. You have to collect rocks to make sure you don't reach 0$. Dues to inflation, you have to keep collecting rocks so they don't lose value. Try reaching 1,000,000$, the best way to earn points is to use the blue bubble, and hit the left handed alien with it. Left handedness has more value.
Credit goes to me, now shoo! get out! I actually did this because of a school assignment.