Fun game, once I figured out (with @Jorava's help) what was going on! The first time, I didn't check the "Settings" button, and had no idea. I thought it was some sort of puzzle game, and was trying to click things with the mouse, and it seemed like nothing worked and I would just go to "Game Over" after a couple seconds.
For those who come later: this is just a vertical scrolling obstacle-avoidance game. You are the white dot. The world will scroll down, and you need to keep up by moving left and right, stepping only on the orange dots. That's it... not too complicated once you know. :)