I have gameplay now:
Er, you can’t tell from the screenshot, but the small square is your mouse cursor. The large square that is the same color is the goal. There are as many obstacles as the level number, so level #5 will have five obstacles.
The rectangles are obstacles you need to avoid to get to the goal. If you touch an obstacle, you go back to the beginning. They vary in size, so sometimes a single pixel can trip you up. Be careful!