Square on the left: a to move left, d to move right. Square on the right: left arrow to move left, right arrow to move right. With BOTH squares, avoid the edge, the line in the middle, and the blocks that are coming down. For every 20 points, the speed of the game will increase. If you get to 21 it will go two times as fast. If you get to 41 it will go three times as fast as the original, and so on.
Code by me. Idea by me. Tested by me. In other words, all by me. This game gets MUCH harder the further you go. Please notify me of any glitches.