The balls moving around isn't as bad as Ymir said; they have a slight problem, the gravity effect seems to get funky, and decide to give the ball a random boost while in the air. 3/5 game for graphics.
The "left key?..." What exactly is the left key. The mouse doesn't work, the left arrow doesn't work, and the A key doesn't work. I'm out of ideas. Terrible game, 1/5.
Extremely hard. 3/5, great game though; just like I said, extremely hard. Can't beat level 5 because there's no way I can successfully keep the smog down but yet make enough energy for the flood lights and the electric things (There's not enough metal to go the bullet way).